If 96.3 g of A1203 decomposed, determine the percent yield of 02 if you
isolated 43.2 g 02.
2Al₂O3 →4A1+30₂
Your answer
25 points
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I need answer asap

The pH of a solution with a hydronium concentration of 2.56 x [tex]10^{-6[/tex] M would be 5.59.

The pH of a substance is the degree of acidity or alkalinity of the substance. It is simply a measure of how acidic or basic the substance is.

The pH of any substance is mathematically expressed as:

pH = -log [tex][H^+][/tex]

where [tex][H^+][/tex] is the hydrogen ion concentration.

pH = 14 - pOH

Also,

pH = - log [tex][H_3O^+][/tex]

Where [tex][H_3O^+][/tex] is the hydronium ion concentration.

In this case, the hydronium ion concentration is given as 2.56 x [tex]10^{-6[/tex]M

Thus,

pH = -log 2.56 x [tex]10^{-6[/tex]

    = 5.59

In other words, the pH of a solution that has a hydronium ion concentration of 2.56 x [tex]10^{-6[/tex] M is 5.59.

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The molarity of the sodium chloride solution is 1.95 M.

The term molarity has to do with the concentration of  substance in mole per decimeter cubed. There are several units of concentration and in every case, there is always a given unit of concentration that is most apt to be used at that point.

Given that;

Mass of the sample = 42.5 g

Molar mass of NaCl = 58.5 g/mol

Volume of the solution = 375 ml or 0.375 L

Number of moles of NaCl = 42.5 g/58.5 g/mol = 0.73 moles

Molarity of the solution = 0.73 moles/0.375 L = 1.95 M

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By the use of the Avogadro's number, the atoms are found to be 7.2 * 10^ 14 atoms in number.

We know that we can be able to use the Avogadro's number to be able to obtain the number of atoms that we can find in the atom. In this case, we have been told already that the molar mass of the atom is  241.1 g/mol. This implies that one mole of the atom does contain a mass of 241.1 g. With this settled, the number of atoms in one mole of the atom can be gotten as the Avogadro's number which is 6.02 * 10^23 atoms.

Thus we have;

If 241.1 g does contain about 6.02 * 10^23 atoms

2.90 * 10^-7 g would now be found to contain;

2.90 * 10^-7 g *  6.02 * 10^23 atoms/241.1 g

= 7.2 * 10^ 14 atoms

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Missing parts;

Calculate the answer. The molar mass of americkom-241 is 241.1 g/ mol. A new smoke detector button contains 0.290 micrograms

Answer: Gas

Explanation:

When they mix, hydrogen gas is produced.

The number of moles in 500g of CaO, CaCO₃, C₁₂H₂₂O₁₁, NaOCl, and CO₂ are 8.93, 5, 1.46, 6.71 and 11.36 moles.

A mole is a scientific unit that is used to determine the number of atoms, molecules, ions, etc. The number of entities in 1 mole was found 6.023 × 10 ²³ per mole which is known as Avogadro’s constant.

a) Given, the mass of each substance = 5 ×10² g

The molar mass of CaO = 56 g

The number of moles in 5 ×10² g of CaO = 500/56 = 8.93 moles

The number of molecules in 8.90 moles of CaO = 8.93× 6.023 × 10 ²³

                                                                               = 53.77 ×10²⁴ formula unit

b) The molar mass of CaCO₃ = 100 g

The number of moles in 5 ×10² g of CaCO₃ = 500/100 = 5 moles

The number of molecules in 5 moles of CaO = 5× 6.023 × 10 ²³

                                                                               = 3.0 ×10²⁴ formula unit

c) The molar mass of C₁₂H₂₂O₁₁ = 342.3 g/mol

The number of moles in 5 ×10² g of  C₁₂H₂₂O₁₁ = 500/342.3 = 1.46 moles

Number of molecules in 8.90 moles of C₁₂H₂₂O₁₁ = 1.46 × 6.023 × 10 ²³

                                                                               =   8.8 × 10 ²³

d) The molar mass of NaOCl = 74.5 g/mol

The number of moles in 5 ×10² g of NaOCl = 500/74.5 = 6.71 moles

The number of molecules in 8.90 moles of CO₂ = 6.71× 6.023 × 10 ²³

                                                                               = 4.04 ×10²⁴

e) The molar mass of CO₂ = 44 g/mol

The number of moles in 5 ×10² g of CO₂ = 500/44 = 11.36 moles

The number of molecules in 8.90 moles of CO₂ = 11.36× 6.023 × 10 ²³

                                                                               = 6.84 ×10²⁴

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Mass of NO2 is 158.73 grams

In chemistry, the most commonly used unit for molarity is the number of moles per liter, which is having the unit symbol mol/L or mol/dm3 in SI unit. A solution with a concentration of 1 mol/L is said to be 1 molar, commonly designated as 1 M.

To calculate the mass from the number of moles we use the below given formula;

number of moles =  Weight of the substance

                                       Molecular mass

Weight or mass = number of moles × molecular mass

 weight = 3.45 × 46.01

             = 158.73 grams

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Based on the x-ray,  the thing that could have caused the injury in both of these images is that the wounds and cave-in of the broken bone can point to blunt force trauma, which may have resulted from a fall and hitting his head or from an animal striking him in the head.

It gave precise information necessary for a precise forensic reconstruction of King Tut. The 1,700 digitized X-ray images in cross section created by the CT scan showed the mummy from head to toe. It displayed a gray head, neck vertebrae, a hand, numerous pictures of rib cages, and a skull cut in half.

Note that researchers published its findings, concluding that the corpse's head was likely broken either during embalming or during research by archeologist Howard Carter's team, which found the mummy in 1922.

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See full question below

The x-ray on the right is pointing out an area on the back and bottom of Tut's skull. The large white part is Tut's skull. Notice the smaller white part that the arrow is pointing to. The separation between these two white areas indicate an injury to Tut's skull. What could have caused the injury in both of these images?

Two ATP were created, two NAD+ were converted to two NADH + H+, and two glucose molecules were divided into two pyruvate molecules during the glycolysis process.

Anaerobic glycolysis predominates when there is no oxygen present (anaerobic conditions) and in cells without mitochondria. As lactate dehydrogenase reoxidizes NADH to NAD+, the pyruvate is degraded to lactate. Erythrocytes, which lack mitochondria, rely on this mechanism as a major source of ATP.

Pyruvate will go through a process known as fermentation when oxygen is absent or if an organism is unable to engage in aerobic respiration.

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A player can obtain the desired outcome by sticking to their initial strategy, according to the Nash equilibrium, a decision-making theorem in game theory. Each player's approach in the Nash equilibrium is the best one given what the other players have decided.

A Nash equilibrium is a situation in which no participant would profit from altering their current course of action. This implies that even if a player were to know the plans of every opponent, they would still decide to stick with their original plan. Assuming that the other players maintain their initial plans, a player does not benefit from changing their approach under the Nash equilibrium. There could be several Nash equilibria in a game, or none at all. One of the fundamental ideas in game theory is Nash equilibrium.

Assign A the probability of playing H and (1p) of playing T, and B the probability of playing H and (1q) of playing T to calculate the mixed-strategy Nash equilibrium. In this game, the mixed-strategy Nash equilibrium is for each player to select H or T at random with p = 1/2 and q = 1/2.

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Temperature has an impact on the hot air balloon's internal pressure. The molecules move more quickly and forcefully against the interior wall of the balloon as they warm up.

Because the average kinetic energy of the gas molecules in a balloon drops as temperature rises, the frozen balloon shrank. As a result, the molecules move more slowly and collide with the balloon's interior wall less frequently and weakly, causing the balloon to somewhat contract.

These illustrations show how temperature can change the volume of a fixed amount of a confined gas while maintaining a constant pressure are generally accurate: The volume rises with rising temperature and falls with falling temperature.

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Answer:

3.02 atm

Explanation:

To find the final pressure, you need to use the Combined Gas Law:

[tex]\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}[/tex]

In this equation, "P₁", "V₁", and "T₁" represent the initial pressure, volume, and temperature. "P₂", "V₂", and "T₂" represent the final pressure, volume, and temperature. You first need to convert the temperatures from Celsius to Kelvin (1°C = 273 K). You should convert the initial pressure from kPa to atm (1 atm = 101.3 kPa).

P₁ = 536 kPa / 101.3kPa  =  5.29 atm         P₂ = ? atm

V₁ = 2.50 L                                                  V₂ = 3.75 L

T₁ = 75.0 °C + 273 = 348 K                         T₂ = 25.0°C + 273 = 298 K

[tex]\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}[/tex]                                                       <----- Combined Gas Law

[tex]\frac{(5.29atm)(2.50L)}{348K}=\frac{P_2(3.75L)}{298K}[/tex]                                 <----- Insert values

[tex]0.0380=\frac{P_2(3.75L)}{298K}[/tex]                                             <----- Simplify left side

[tex]11.32 = P_2(3.75L)[/tex]                                             <----- Multiply both sides by 298 K

[tex]3.02 = P_2[/tex]                                                           <----- Divide both sides by 3.75 L

Answer: 2.40 X10^24

Explanation: Utilizing Avogadro's Number of 6.022 X 10^23

112gSi X 1molSi/28.09gSi X 6.022 X 10^23/1molSi = 2.40 X 10^23

Answer: 0.5643 mol NaOH

Explanation:

First, I would start off with plugging in what you can for the molarity equation, which is:

M = mol/L

So, since you have 0.285M and 1.98 L you can plug that in where it fits. So it’d be:

0.285M = mol/1.98L

To isolate the mols on one side of the equation, you multiple both sides by 1.98 L. (Because it’s in the denominator. If you were trying to find L, you would divide by # of mols since it’s in the numerator).

After multiplying, your final answer should be 0.5643 mols of NaOH.

If a scientist describes a piece of glass as, “clear, one pound, and square.” the thing he is MOST likely describing are C. physical properties

This refers to the characteristics of a property that is measurable, and its shape can be observed, without any necessary outward or external change such as density, size, volume, etc

Hence, it can be seen that based on the given description, it is stated that a piece of glass contains the following properties: “clear, one pound, and square.” and this shows its physical properties.

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The decomposition reaction of sodium carbonate produces  0.094 moles and 2.5 L of carbon dioxide

We know that the decomposition of the one mole of sodium carbonate would produce one mole of carbon dioxide. Hence we need to apply the stoichiometry of the reaction in order to be able to solve the problem.

Number of moles of moles of sodium carbonate = 10g/106 g/mol

= 0.094 moles

Since one mole of sodium carbonate produces one mole of carbon dioxde then 0.094 moles was produced.

Given that;

Pressure = 750. torr or 0.99 atm

Volume = ?

Temperature = 50.°C + 273 = 323 K

Then;

PV = nRT

V =nRT/P

V = 0.094 moles  * 0.082 * 323/0.99

= 2.5 L

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Answer:

Explanation:

Thanks

Answer:

Explanation:

Look at the objective lens (3) and the stage from the side and turn the focus knob (4) so the stage moves upward. Move it up as far as it will go without letting the objective touch the coverslip. Look through the eyepiece (1) and move the focus knob until the image comes into focus.

The percent yield of the reaction would be 91.66%.

The percent yield of a reaction is the actual yield from the reaction relative to the theoretical yield of the same reaction.

The percent yield of a reaction is mathematically expressed as follows:

percent yield = actual yield/theoretical yield x 100%

From the equation of the reaction:

[tex]Na_2CO_3 + CaCl_2 --- > CaCO_3 + 2NaCl[/tex]

The mole ratio of [tex]CaCl_2[/tex] to [tex]CaCO_3[/tex] according to the balanced equation is 1:1.

Recall that: mole = mass/molar mass

The molar mass of  [tex]CaCl_2[/tex] is 110.98 g/mol

mole of 17.15 g  [tex]CaCl_2[/tex] = 17.15/110.98

                                     = 0.1545 mol

Equivalent mole of  [tex]CaCO_3[/tex] = 0.1545 mol

Molar mass of [tex]CaCO_3[/tex] = 100.09 g/mol

Mass of 0.1545 mol [tex]CaCO_3[/tex] = 0.1545 x 100.09

                                              = 15.46 g

Thus:

Theoretical yield = 15.46 g

Actual yield = 14.17 g

Percent yield = 14.17/15.46 x 100

                      = 91.66%

In other words, the percent yield of the reaction is 91.66%.

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The mass in grams of 23.0 L of propane vapor at STP is 22.968 g, as calculated by the mole concept.

moles = 23/44 = 0.522 moles

Since there are 0.522 moles in a 44 liter, the mass of 23 L of propane is equal to 44 x 0.522, or 22.968 g.

Therefore, 23 liters of propane contain 22.968 g of propane at STP.

The definition of a mole is a measure of substance quantity. It is a unit of measurement used to determine how many elementary particles make up a specific substance.

It has a precise definition of 6.022 1023 elementary entities. Depending on the kind of substance, the elementary unit may be a molecule, atom, or ion. Avogadro's number is the quantity of elementary particles in a mole.

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Answer:

What is the question?

Explanation:

The element that has the following electronic configuration are :

a) the atomic number of selenium is 34. the electronic configuration is given as :

electronic configuration : 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰  4p⁴

b) the atomic number of bromine is 35 . the electronic configuration is given as :

electronic configuration : 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰  4p⁵

c) the atomic number of krypton is 36 . the electronic configuration is given as :

electronic configuration : 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰  4p⁶

d)  the atomic number of francium is 87. the electronic configuration is given as :

electronic configuration : 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰  4p⁶ 4d¹⁰ 5s² 5p⁶ 4f¹⁴ 5d¹⁰ 6p⁶ 7s¹

Thus, The element that has the following electronic configuration are :

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The specific heat of the given substance is equal to 0.447 J/g°C. As the energy is absorbed by the substance therefore it is an endothermic process. From the given table the substance can be iron.

The specific heat capacity of a material can be defined as the quantity of heat required to raise the temperature in one unit of material by one-degree Celcius.

When the heat is lost or absorbed, the temperature of the material will be changed following the equation:

Q = mCΔT

Given, the amount of energy absorbed, Q = 18.942 KJ

The mass of the substance, m = 345 g

The change in the temperature = 167.7 - 45 = 122.7°C

The specific heat for the given substance can be determined as:

18.942 × 1000 = 345 × C × 122.7

C = 0.447 J/g°C

Therefore, the specific heat of the substance is equal to 0.447 J/g°C.

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Answer:

C) High pressure and low temperature

Explanation:

Le Chatelier's principle. There are 4 mols of gas on the reactants side and 2 moles of gas on the products, as well as some heat. By Le Chatelier's principle, if you increase the pressure (by presumably decreasing the volume), then equilibrium will push to the side with fewer moles, in this case ammonia. Since heat is on the products side, it works like a product. If you take away a product (decreasing temperature/product), then the reaction will push to ammonia to make up for the loss.

We can you conclude from the deflection of a cathode ray in a magnetic field that the ray must be composed of charged particles. Hence Option C is correct

J.J. Thomson came to the conclusion that rays were and are primarily negatively charged particles present or moving in a set of a positive charge after completing the experiment. The structure of an atom was further understood by physicists thanks to this idea. He also made the important discovery that the cathode rays' or electrons' properties were independent of the cathode ray tube's kind of gas or the electrodes' material. All all, we can conclude from this that all atoms are made up primarily of electrons.

The positively charged particle is called a A tiny nucleus, also known as a nucleus, houses all of the positive charge and the majority of the mass of an atom. A proton is a positively charged subatomic particle. The majority of an atom's volume is made up of empty space.

The number of positively charged protons in the nucleus is equal to the number of electrons that are distributed outside the nucleus. This describes how an atom's overall electrical neutrality.

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Empirical formula of the metal fluoride is CuF₂

Empirical formula is the simplest whole number ratio of atoms present in a compound

Here given data is

Mass of copper heated =  23.02 gram

Mass of copper fluoride formed = 37.87 g

We have to calculate gas in copper fluoride = x

37.87 g = 23.02 gram + x

x = 37.87 g - 23.02 gram

x = 14.85 g

Moles of copper

23.02 gram/63.546g/mol = 0.362 mol

Moles of Florine

14.85 g/18.998g/mol =0.781 mol

For the empirical formula divide the smallest mole of an element with all the moles of elements present in the compound

Copper = 0.362 mol/0.362 mol = 1

Florine =0.781 mol / 0.362 mol = 2.15

It means 1 : 2

So the empirical formula of the metal fluoride is CuF₂

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Answer:

Explanation:

Have you done any Lewis diagrams?   your picture of the drawings are kind like a Lewis diagram,  showing the electrons filling of the outer shell.   The outer shell balancing is what holds the atoms together in molecules.  That's what  you are showing in your drawing.   How the atoms "stick" together.

An electric immersion heater is put at the bottom of a large tank of water the water next to the heater becomes warm then warmed water next to the heater energy will travel up from the heater through the particles

The water is heated up from the inside and usually with electricity a strong electric current run through a large element inside the tank to directly heat the water around it and energy will travel up from the heater through the particles and making them faster and further apart and meaning they become less dense and when water is heated with immersion heater the water become less dense due to which the warm water rises up and the cooler water fill its space

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Answer: Titanium dioxide

The two possible sources of error that could contribute to your percent error include the following below:

This is a term which is referred to as the difference between the estimated value and the actual value in comparison to former and is usually expressed as a percentage.

However, there are different types of factors which contribute to this type of error and an example is the estimation process used which could result in non uniform value and also the type of measuring instrument and the conditions in which they are used.

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Answer:i try and try but nobody likes me

Explanation: that's the story of the day lucky person brainiest pls

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