if 2 molecules of ch4 react with 5 molecules of o2 , determine the number of molecules of co2 that could form from each starting material.

Answers

Answer 1

The moles of CO₂ that can be formed from each reactant are:

2 moles of methane = 2 moles of CO₂5 moles of O₂ = 2.5 moles of CO₂

What is the equation of the combustion of methane?

The  equation of the combustion of methane is given below as follows:

CH₄ (g) + 2 O₂ (g) ---> CO₂ (g) + 2 H₂O (g)

From the equation of the reaction, 1 mole of methane reacts with 2 moles of oxygen to produce 1 mole of carbon dioxide ad 2 moles of water.

Given that there are 2 molecules of CH₄ reacting with 5 molecules of O₂. the moles of CO₂ that can be formed from each reactant are determined from the mole ratio of the reactants and products as given in the equation of the reaction.

2 moles of methane will produce 2 moles of CO₂

5 moles of O₂ will produce 5 * 1/2 moles of CO₂ = 2.5 moles of CO₂

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Related Questions

what products are formed when cis-3-methyl-3-hexene reacts with hydrogen bromide? a) (2r,3s)-3-bromo-3-methylhexane b) (2r,3r)-3-bromo-3-methylhexane c) (2s,3r)-3-bromo-3-methylhexane d) (2s,3s)-3-bromo-3-methylhexane e) all of the above answers

Answers

The product formed when cis-3-methyl-3-hexene reacts with hydrogen bromide is 2s,3r)-3-bromo-3-methylhexane This happens through  SN1 reaction.

Cis-3-methyl-3-hexene will react with HBr through SN1 reaction. First, the H from HBr will add to the less substituted carbon in the double bond following Markonikov's rule to form a stable tertiary carbocation intermediate.

The ionic addition of hydrogen halides to alkenes proceeds through SN1. The first step involves the protonation of the alkene by the hydrogen halide that is present. This step follows the Markonikov's rule, which predicts that the proton will add to the less substituted carbon in the double bond or to the more substituted carbon atom to form the more stable carbocation. The next step is the addition of the halide ion to the carbocation. Here, the halide can add to either side of the carbocation; thus, forming a mixture of R and S products.

Cis-3-methyl-3-hexene will react with HBr Through SN1. First, the H from HBr will add to the less substituted carbon in the double bond (Markonikov's rule) to form a stable tertiary carbocation intermediate. Br− will then add to either side of the carbocation to form a mixture of (3S)-3-bromo-3-methylhexane and (3R)-3-bromo-3-methylhexane.

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which naturally occurring atmospheric gas is particularly of concern to scientists studying human-generated greenhouse gases?

Answers

Methane, nitrous oxide, carbon dioxide, and other manmade compounds are among the main greenhouse gases. Since it now contributes the most to the warming caused by human activity, carbon dioxide is sometimes cited as the most significant anthropogenic greenhouse gas.

About half of all carbon dioxide emissions from human activity between 1750 and 2010—the most common and longest-lasting greenhouse gas—were produced in just the previous 40 years, primarily as a result of the burning of fossil fuels and industrial operations.

What is Atmospheric gas ?

Gases found in the atmosphere of the Earth are known as atmospheric gases. Although greenhouse gases (carbon dioxide, methane, nitrous oxide, water vapor, and ozone) make up 1% of the air, oxygen and nitrogen make up 99% of these gases.

About 78% of the gases in the Earth's atmosphere are nitrogen, 21% are oxygen, 0.9 % are argon, and 0.1 % are other gases. The remaining 0.1 percent of gases includes trace amounts of neon, water vapor, methane, carbon dioxide, and methane.

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difference between the paper chromatography and chromatography​

Answers

Answer:

Paper chromatography requires less preparation, whereas thin layer chromatography requires more preparation time. The stationary phase of paper chromatography is the water trapped in the cellulose filter paper. The stationary phase of the thin layer chromatography is the glass plates coated with silica gel.

Explanation:

How do two repelling magnets demonstrate that objects that are not in contact exert forces on each other?

Answers

Answer:

If you placed the two magnets so that opposite poles are facing each other, the force will be attractive and you will need to add more mass to the opposite side of the scale Magnetic attraction and repulsion is one of three fundamental non contact forces in nature

If there’s a attraction it comes towards one on other if there repulsion the opposite happens.

Explanation:

If you pour hot soup into a bowl, and the bowl stays cool to the touch, you can assume that
A
the bowl is a good insulator of heat.

B
the bowl is a good conductor of heat.

C
the bowl’s temperature cannot be measured.

D
the bowl transfers most of its heat through radiation.

Answers

I believe this would be A

vapor pressure will increase with:

Answers

Vapor pressure will increase with Temperature.

What does vapor pressure mean exactly?

The vapor pressure of a liquid is the pressure at which a vapor and its liquid (or solid) are at equilibrium, or the pressure at which a sample of a liquid (or solid) evaporates in a closed container to produce a vapor.

Vapor pressure for liquids is influenced by the following variables: Intermolecular Force and Temperature

The molecules of a liquid begin to move more quickly as the temperature rises. More vapor pressure is produced as a result of the production of gas. As a result, vapor pressure and temperature are directly related. The related graph will be a straight line graph since temperature and vapor pressure are directly proportional to one another.

Hence, Vapor pressure will increase with Temperature.

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A resource is being used by a population.

Which graph represents a rapidly diminishing resource?

Responses

Graph A

Graph A

Graph B

Graph B

Graph C

Graph C

Graph D

Graph D

Answers

Answer:

Graph A.

Explanation:

Graph

It represents a constant function

Answer:

graph c

Explanation:

A student is reacting magnesium and hydrochloric acid by placing a strip of Mg
metal into a beaker containing HCL solution. Which of the following would
increase the rate of reaction between the Mg and the HCL?



removing some of the HCL solution from the beaker

freezing the Mg strip before adding it to the beaker


cutting the Mg strip into smaller pieces

adding less HCl to the initial solution

Answers

For the student who is reacting magnesium and hydrochloric acid by placing a strip of Mg metal into a beaker containing HCl solution, the rate of reaction between the Mg and the HCl will be increased by:

cutting the Mg strip into smaller pieces; option C

What is the rate of a chemical reaction?

The rate of a chemical reaction is the rate at which the reactant molecule is converted or the rate at which product molecules are formed.

Mathematically;

Reaction rate = mole of reactants converted or mole of product formed / time taken

The factors that affect the rate of a reaction are:

temperaturepressureconcentrationpresence of a catalystthe surface area of the reactants - reaction rate increases with an increase in the surface area of the reactants

In the given reaction, the surface area of the reactants can be increased by cutting the magnesium metal strips into smaller pieces thus, increasing the reaction rate.

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Answer:

It C smh smh

Explanation:

Usatest prep and expert explanation

How does the brain respond to an increase in body temperature?
a) Constricting the blood vessels and reducing blood supply the skin.
b) Dilating the blood vessels and increasing blood supply the skin.
c) Decreasing the amount of ADH so more water is lost in the urine.
d) Increasing the amount of ADH so less water is lost in the urine.

Answers

Answer: B - Dilating the blood vessels and increasing blood supply the skin.

Explanation:

If body temperature rises, blood vessels in the skin dilate, allowing more blood to flow near the skin’s surface. This allows heat to dissipate through the skin and into the surrounding air.

palmitic acid only contains two oxygens per sixteen carbons, whereas glucose has six oxygen atoms per six carbons. explain the significance of this when each molecule is fully oxidized

Answers

The significane is that it generates more ATP per carbon (128/16) than glucose (38/6).

What is Palmitic acid?

Palmitic acid increases LDL cholesterol levels more than other saturated fats, such as stearic acid. According to them, there is compelling evidence that high consumption of palmitic acid increases the risk of cardiovascular disease. Palmitic acid has only two oxygen atoms for every sixteen carbons, whereas glucose has six oxygen atoms for every six carbons. As a result, when fully oxidized, palmitic acid generates more ATP per carbon (128/16) than glucose (38/6). As a result, we use fat as our primary energy storage material.

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What are the first 20 elements A?

Answers

Answer:

The first 20 Elements of the Periodic Table: Hydrogen, Helium, Lithium, Beryllium, Boron, Carbon, Nitrogen, Oxygen, Fluorine, Neon, Sodium, Magnesium, Aluminium, Silicon, Phosphorus, Sulphur, Chlorine, Argon, Potassium, Calcium.

Explanation:

hope this helps:)

The first 20 Elements of the Periodic Table are given below:

What is an element?

A chemical element is a type of atom with a particular number of protons in the nucleus, such as the specific compound made up entirely of that species. Chemical elements, unlike chemical compounds, cannot be broken down into simpler substances by any chemical reaction. The number of protons in the nucleus is an element's defining attribute, and it is symbolised by the symbol Z - all atoms with the same atomic number are atoms of the same element. Atoms are rearranged into new compounds linked together by chemical bonds when various elements undergo chemical reactions.

The first 20 Elements of the Periodic Table are given below:

Hydrogen (atomic number 1), Helium (atomic number 2), Lithium (atomic number 3), Beryllium (atomic number 4), Boron (atomic number 5), Carbon (atomic number 6), Nitrogen (atomic number 7), Oxygen (atomic number 8), Fluorine (atomic number 9), Neon (atomic number 10), Sodium (atomic number 11), Magnesium (atomic number 12), Aluminium (atomic number 13), Silicon (atomic number 14), Phosphorus (atomic number 15), Sulphur (atomic number 16), Chlorine (atomic number 17), Argon (atomic number 18), Potassium (atomic number 19), Calcium (atomic number 20).

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Why do you believe knowing how elements and compounds react together is essential in everyday matters?

Some elements are more "reactive" than other elements; why do you think this is?

Answers

It is very important to know how elements and compounds react together because everything that surrounds us is made out of elements and compounds. Therefore, understanding how these work can allow us to have a better understanding of the world that surrounds us. Moreover, it can avoid accidents when we deal with dangerous compounds, such as when we cook or clean.

Some elements are more "reactive" than other elements because the number of electrons in the outermost shell of the atom is greater that that of others.

What are elements?

A chemical element is a species of atoms that have a given number of protons in their nuclei, including the pure substance consisting only of that species.

The known elements have certain properties that helps in their identification .Those properties include  but are not limited to the following:

elements has  conductivity, elements has  magnetism, elements has melting point, elements has boiling point, elements has color, elements has state of matter etc.

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Answer:

it is very important to know how elements and compounds react together because everything that surrounds us is made out of elements and compounds. Therefore, understanding how these work can allow us to have a better understanding of the world that surrounds us. Moreover, it can avoid accidents when we deal with dangerous compounds, such as when we cook or clean.

Explanation:

select all the strong bases from the following list. multiple select question. ca(oh)2 h2so4 nh3 naoh koh

Answers

Strong bases are Ca(OH)₂, KOH, NaOH

A strong base is a substances that behave like a base and dissociates completely to give a solution that is composed of its ion and conjugate acid and hydroxyl ion bases are substances that accept hydrogen ion H⁺ from other atom and a strong base is a base that is completely dissociated in an aqueous solution and these compound ionize in water to yield one or more hydroxide ion per molecule of base

So in that given data Ca(OH)₂, KOH, NaOH this is the strong bases because in the OH⁻ hydroxide ion yield one or more hydroxide ion per molecule of base

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How many molecules in 35 g of CO2

Answers

Answer:

35/44* 6.022*10^24

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Explanation:

What does the Virtual California model show most clearly? Earth science

Answers

"Virtual California" is a topologically realistic model used to simulate earthquakes in the San Andreas fault system.

The model includes elastic interactions between faults in the model, driving at the correct plate tectonic rate, and friction physics at faults using physics derived from laboratory models with parameters consistent with past seismic events. includes science. An important consequence of elastic interactions in models is the correlation of event occurrences and the emergence of spatiotemporal patterns. Without interaction, each error element works independently. Cooperative phenomena and patterns can be seen in interactions.

Previous numerical analyzes of this simulation focused on the distribution of repetition times between large events. From this, we can calculate the latency to the next major earthquake and create a hazard forecast for the California Fault. We propose and develop a new method for generating and evaluating synthetic earthquake catalogs using Virtual California. The goal of scoring is to use the paleoseismic data to identify intervals within the man-made data that best resemble current California seismic conditions. Primarily using the highest scoring states to calculate wait times and create earthquake forecasts. An alternative method involves using all states weighted to reflect how similar the recent past is to the observed data. In this way, we integrate paleoseismic data into the simulation. In this talk, I will explain how to do it, give some examples of scoring methods, the results of calculating conditional probabilities that future events will occur, and what these probabilities were calculated using all the data. report how it differs compared to all data.

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EXPERIMENT: USING THE TYNDALL EFFECT TO IDENTIFY COLLOIDS

These supplies are needed:

3 clear glasses with smooth sides
laser pointer or flashlight
red Jell-O
red food coloring
sugar
water
Procedure:

Using the regular recipe, mix up the Jell-O and fill one glass with the mixture. Let chill until it gels. Fill another glass with water and let settle until the air bubbles disperse. Fill the third glass with water and add 2 drops of food coloring and two tablespoons of sugar into the water in the third glass. Stir until you are sure the sugar is completely dissolved.

When all three glasses are ready, line them up in any order and shine the laser (or flashlight) through all three glasses at the same time.

Answer these questions:

What did you observe?
What is the Tyndall effect?
Which glass displayed the Tyndall effect?
What does that tell you about the substance in the glass?
Which glass represents a pure substance?
Which glass represents a solution?

Answers

The glass with Jell-O is a colloid, the glass with plain water is a pure substance, and the glass with sugar and red food coloring is a solution.

What I observed is that the light was scattered more in the glass with the Jell-O mixture and the glass with the sugar water. The light was not scattered in the glass with just plain water.

The Tyndall effect is the scattering of light by particles in a colloid or fine suspension.

The glass with the Jell-O mixture displayed the Tyndall effect. This tells me that the substance in the glass is a colloid.

The glass with just plain water represents a pure substance.

Therefore, the glass with the sugar water and food color represents a solution. The glass with the Jell-O mixture represents a colloid.

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explain how water's entropy can decrease when it freezes without violating the second law of thermodynamics. specifically, explain what happens to the entropy of its surroundings

Answers

Entropy of water can decrease when it freezes without violating the second law of thermodynamics because there is increase in the entropy of the surroundings.

How can water's entropy decrease when it freezes?

The reason that the freezing water does not violate the second law of thermodynamics is because even though the system becomes more ordered and has low entropy, energy that is released to the surroundings makes molecules move faster, which ultimately leads to an entropy  increase of the surroundings.

The process of liquid -> solid is exothermic. This implies that heat released in the process causes an increase in the entropy of the surroundings. Therefore, if surroundings are included, then ΔSFreeze+ΔSSurroundings>0, which is in accordance with the second law.

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In the calvin cycle, if nadph begins to run out, what would be the first compound to accumulate?.

Answers

The first compound to accumulate is 1,3-bisphosphoglycerate.

Carboxylation is step one within the Calvin cycle where carbon dioxide is bonded to a five-carbon sugar called RuPB. though it is known as the darkish response the Calvin cycle does not surely occur within the darkish or all through the nighttime time. that is because the procedure requires NADPH, which is short-lived and is derived from light-structured reactions.

The reactions of the Calvin cycle add carbon to an easy 5-carbon molecule referred to as RuBP. these reactions use chemical energy from NADPH and ATP that have been produced in the light reactions. The very last manufactured from the Calvin cycle is glucose. The Calvin cycle reactions may be organized into 3 simple degrees fixation discount and regeneration.

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in a lead chloride (pbcl2) saturated solution at an elevated temperature, the chloride ion concentration, [cl-], is 4.20 * 10^-2 m. what is the value of ksp for pbcl2 at this temperature?

Answers

To learn about the saturated solution and concentration to find the value of Ksp.

What is saturated solution?

When a solution has dissolved all of the solute it is capable of removing, it is said to be saturated. At a certain temperature, a saturated solution cannot dissolve any more solute. We can create a saturated solution by continuing to dissolve the solute until no more can be done.

What is concentration?

In chemistry and related fields, the idea of concentration is used frequently. It is a way to gauge how much of one substance is incorporated into another.

The ionic compound lead(II) chloride, or PbCl2, does not completely dissociate into lead(II) cations and chloride anions when placed in aqueous solution.

Instead of completely dissociating, a state of equilibrium will be established between the solid lead (II) chloride and the dissolved ions under the control of the solubility product constant, K sp.

PbCl 2(s) + 2 Cl (aq] Pb 2 + (aq]

The compound's molar solubility, or s in moles, represents the amount of lead(II) chloride that will dissolve in aqueous solution at a given temperature.

A mole of lead II chloride will result in the production of 1 mole of lead II cations and 2 moles of chloride anions. To determine the molar solubility of the solid, use an ICE table.

PbCl 2(s) + 2 Cl (aq] Pb 2 + (aq]

I      0        0

C     (+s)     (+2s)    

E      s          2s

According to the definition, the solubility product constant will equal

Ksp = (pb²⁺) (cl⁻)²

Ksp = s⋅ (2s)²= 4s³

As a result, lead (II) chloride will have a molar solubility of

4s³=1.6⋅10⁻⁵⇒ s= [tex]\sqrt[3]{1.6/4*10^-5}[/tex] = 0.0159 M.

Therefore, the value of ksp for pbcl2 at this temperature is 0.0159 M.

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A lever has a 36 cm input arm and a 6 cm output arm. Find MA.

Answers

The mechanical advantage of the lever that has a 36 cm input arm and a 6 cm output arm is 0.167.

What is mechanical advantage?

Mechanical advantage is the ratio of the output force produced by a machine (especially a simple machine) to the applied input force.

This means that mechanical advantage of a machine can be calculated by dividing the output force by the input force as follows:

MA = Fb/Fa

Where;

MA is the mechanical advantageFb = force of the objectFa = effort to overcome the force of the object

According to this question, a lever has a 36 cm input arm and a 6 cm output arm. The mechanical advantage can be calculated as follows;

MA = 6cm ÷ 36cm

MA = 0.167

Therefore, 0.167 is the mechanical advantage of the lever.

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draw the correct electron-dot structure h2s , hydrogen sulfide, a poisonous gas produced by rotten eggs. draw the molecule by placing atoms on the grid and connecting them with bonds. include all lone pairs of electrons.

Answers

Hydrogen sulfide, H₂S is a colorless gas with a strong odor of rotten eggs.

Hydrogen sulfide may additionally motive infection to the eyes and respiration system. It could also motive apnea, coma, convulsions; dizziness, headache, weak spot, irritability, insomnia; belly disappointed, and if liquid frostbite.

H‐S -H

Hydrogen sulfide is a drab gasoline recognized for its stinky rotten egg odor at low concentrations. It's miles extremely flammable and exceptionally poisonous. Hydrogen sulfide additionally happens obviously in sewers, manure pits, well water, oil and gas wells, and volcanoes.

It takes place certainly in crude petroleum, natural gasoline, and hot springs. Further, hydrogen sulfide is produced via bacterial wreck- down of natural materials and human and animal wastes, e.g., sewage.

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Predict how oxygen crosses the plasma membrane if the concentration of oxygen is lower inside the cell than it is outside the cell.

Answers

The oxygen crosses the plasma membrane if the concentration of oxygen is lower inside the cell than it is outside the cell is by the simple diffusion.

The diffusion can be defined as the process in which the movement of particles takes place from the lower concentration to the higher concentration through a semipermeable membrane. T he oxygen crosses the plasma membrane if the the concentration of oxygen is lower inside the it the outside the cell called as diffusion.

Thus, The oxygen crosses the plasma membrane if the concentration of oxygen is lower inside the cell than it is outside the cell is by the simple diffusion.

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find the percent by mass of sodium chloride in a 1.45 m nacl solution. the density of the solution is 1.07 g/ml .

Answers

6.616% of sodium chloride is present in solution as a mass percent.

What benefits does chloride provide the body?

An example of an electrolyte is chloride. It functions with additional electrolytes like sodium, potassium, & carbon dioxide (CO2). These compounds support the maintenance of the body's hydrochloric balance and correct fluid balance.

What does chloride in a blood test mean?

One of the elements in your blood is chloride. Chloride blood tests determine whether you have healthy amounts of chlorine in your blood. Dehydration, vomiting, and other medical disorders are just a few of the many things that can lead to an abnormally high quantity of sodium in your blood.

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Which isomer of 1-bromo-3-tert-butylcyclohexane reacts faster when refluxed with potassium tert-butoxide?.

Answers

Trans isomer of  1-bromo-3-tert-butylcyclohexane reacts faster when refluxed with potassium tert-butoxide

Structural isomers are those isomers in which the atoms are completely arranged in a different order but they have the  same molecular formulas. These are the molecules having the same kind of molecular formula with different connectivity which is completely  depending upon the order they are put together.

Cis isomers are molecules with the same connectivity of atoms. They feature that the same side priority groups are placed on the same side of a double bond. Trans isomers feature molecules with same side priority groups placed on opposite sides of a double bond.

In the above given question the trans isomer of 1-bromo-3-tert-butylcyclohexane reacts faster when refluxed with potassium tert-butoxide, because in trans isomer there is less steric hindrance and therefore it can react easily, where as the cis isomer is having a lot of  steric hindrance

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using the ideal gas law, determine how many moles of an ideal gas are required to fill a 1.09 l can at , and 1.00 atm pressure.

Answers

Using the ideal gas law, the moles of an ideal gas required are

Volume = 1.09 L

Pressure = 1.00 atm

Temperature (not given so we take the room temperature) = 25 °C or 298 K

Value of R = 0.0821 atm.L/mol.K

Number of moles = ?

Ideal gas law:

   PV = nRT

Rearrange it for the number of moles (n)

    n = PV / RT

Put the values

    number of moles (n) = 1.00 atm × 1.09 L ÷ 0.0821 atm.L/mol.K × 298 K

    number of moles (n) = 1.09 / 24.46 mol

    number of moles (n) = 0.0446 mol

So 0.0446 mol of an ideal gas is required to fill 1.09 L can.

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the solid oxide of generic metal m is added to 73 ml of water and reacts to produce a metal hydroxide solution that is 0.35 m in the resulting compound. the metal hydroxide solution then reacts with all of the 29 ml of 1.8 m hcl to form water and the metal salt. how many valence electrons must m have?

Answers

2 valence electrons must m have .

What is neutralisation reaction ?

Neutralization is the process by which acids and bases salts and water. When reacting with water, neutralization leaves excess hydrogen or hydroxide ions in solution. The pH of a neutralized solution depends on the strength of the acid or base it contains. Mixing a strong acid and a strong base makes a neutral salt. Mixing a strong acid and a weak base produces an acid. Similarly, when a weak acid is mixed with a strong acid, the salts formed are basic. Neutralization is used in many applications.

For example, acid + base —-> salt + water i. e. NaOH (sodium hydroxide, base) + HCl (hydrochloric acid, acid) ——> NaCl (salt) + H2O (water)react to form

Reaction between metal oxide and H2O

Metal oxide + H2O --> M(OH)x

Reaction between metal oxide and HCl

M(OH)x + xH2O ---> MClx + xH2O

Volume = 29 mL

Molarity of HCl solution = 1.8 M

Moles of HCl = molarity * Volume

Moles of HCl = 1.8 M * 29 mL *10^-3 L/ 1 mL

Moles of HCl = 0.0522 mol

Volume = 73 mL

Molarity of M(OH)x = 0.35 M

Moles of M(OH)x = Volume * Concentration of M(OH)x

Moles of M(OH)x = 73 mL * 10^-3 L / 1mL *0.35 M

Moles of M(OH)2 = 0.02555 mol

x = moles of HCl / moles of M(OH)x

x = 0.0522 mol / 0.02555 mol

x = 2

Number of valance electron = x = 1

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When 0. 485 g of compound x is burned completely in a bomb calorimeter containing 3000 g of water, a temperature rise of 0. 285°c is observed. What is δu of the reaction for the combustion of compound x? the hardware component of the calorimeter has a heat capacity of 3. 81 kj/°c. The specific heat of water is 4. 184 j/g·°c, and the mw of x is 56. 0 g/mol.

Answers

ΔU of the reaction the combustion of compound x is -538 kJ/mol

Combustion is a reaction in which a substance reacts with oxygen gas and releasing energy in the form of light and heat

Here given data is

Mass of compound x = 0.485gram

Mass of water = 3000gram

Temprature rise =  0. 285°C

Heat capacity of the calorimeter = 3. 81 kJ/°C

Specific heat of water =  4. 184 J/g·°C

MW of x = 56. 0 g/mol

Then calculate q

ΔU = ΔH -PΔV

The bomb calorimeter has a constant volume ΔV = 0

ΔU = ΔH

q reaction = q(water + q(bomb)

q(bomb) = 3810J/°C×0.285 = 1085.85J

q(water) = 3000g × 4. 184 J/g·°C×0.285°C = 3577.32 J

q reaction = q(water) + q(bomb)

q reaction = 4663.17 J = 4.66kJ means this is an exothermic

Then calculate moles of compound

Moles = mass/molar mass

Moles = 0.485 g/56.0g/mol

Moles = 0.00866 moles

Then calculate ΔU

ΔU = 4663.17 J/0.00866 moles = 538472 j/mol = 538.5kJ/mol means the reaction is exothermic

ΔU = -538kJ/mol

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an exothermic reaction takes place. which is true of the entropy of the surroundings? group of answer choices it remains constant it decreases it increases insufficient information

Answers

The entropy of the surrounding when an exothermic reaction takes place increases.

What is an Exothermic Reaction?

A reaction is defined as exothermic if the overall standard enthalpy change (H) is negative. Exothermic processes typically releases heat.

Example of Exothermic reaction:

CaO+H2O   Ca(OH)3 + Heat

What is entropy?

Entropy is a measurable physical characteristic and a scientific notion that is frequently connected to a condition of disorder, unpredictability, or uncertainty.

Now you know as in exothermic reaction heat is given to the surrounding hence more heat is added to the surrounding which results in the rising of entropy of the surrounding.

Hence, the entropy of the surrounding when an exothermic reaction takes place increases.

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A 0. 20 mol sample of mgcl2(s) and a 0. 10 mol sample of kcl(s) are dissolved in water and diluted to 500 ml. What is the concentration of cl- in the solution?.

Answers

A 0. 20 mol sample of MgCl₂(s) and a 0. 10 mol sample of KCl(s) are dissolved in water and diluted to 500 ml. the concentration of Cl⁻ in the solution is 1M.

the equations is given as :

MgCl₂  ---->  Mg²⁺   +  2Cl⁻

KCl  ----.  K⁻   +   Cl⁻

moles of chloride ion in MgCl₂  = 2 × 0.20 mol

                                                   = 0.40 mol

moles of chloride ions in KCl = 0.10 mol

total moles = 0.40 + 0.10 = 0.50 mol

volume = 500 mL = 0.5 L

concentration Cl⁻ , molarity = 0.50 / 0.5

                                              =1 M

Thus, A 0. 20 mol sample of MgCl₂(s) and a 0. 10 mol sample of KCl(s) are dissolved in water and diluted to 500 ml. the concentration of Cl⁻ in the solution is 1M.

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A zinc production company uses the following chemical reaction:
Aqueous Solution
Ca
Calcium
15 g
ZnCO₂
Zinc carbonate
25 g
Aqueous Solution
CaCO₂
Calcium carbonate
35 g
What mass of zinc can the company expect to produce?
+
Zn
Zinc
29

Answers

The mass of zinc that the company can expect to produce is 5g.

The reaction is given as follows:

Ca + ZnCO₂ → Zn + CaCO₃

15g       25g      ? g        35g

To find: mass of zn

The above given reaction is an example of a displacement reaction.

According to law of conservation of mass, in a chemical reaction the mass of reactants is equal to the mass of products.

Here, mass of reactants

= mass of Ca + mass of ZnCO₂

= 15g + 25g

mass of products

= mass of Zn + mass of CaCO₃

=mass of Zn + 35g

∵ mass of reactants = mass of products

⇒ 15g + 25g= mass of Zn + 35g

⇒mass of Zn = (15+25)g - 35g

⇒mass of Zn = 40g- 35g

⇒mass of Zn = 5g

Hence, 5g of Zinc is expected to be produced.

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