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
as a sample of radon decays by alpha emission, the number of daughter isotopes……..
When a sample of radon decays by alpha emission, the number of daughter isotopes is two.
What is radioactive decay?Radioactive decay refers to the process by which the nucleus of an atom decays spontaneously with the emission of radiation and the formation of one or more new daughter atoms with as smaller nuclei.
The emission of an alpha particle during radioactive decay involves the emission of helium nuclei.
The emission of alpha particles by radon is shown below:
²²²₈₆Ra ---> ²¹⁸₈₄Po + ⁴₂He
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Which elements have an ionization energy greater than that of silicon?
Answer:
Carbon has the greatest ionization energy in that group.
Explanation:
I don't know if this is helpful but my teacher used ice cream to explain ionization energy to us. Imagine an ice cream cone standing up straight, ionization energy decreases as you go down, just like how the ice cream cone gets smaller as you go down cause the base of the cone is just a small tip. If you imagine an ice cream cone falling over then it could now be sideways and ionization energy increases from left to right across the periodic table, just like the ice cream cone begins small at the tip and as you go to the right it increases in size.
What is the shape and bond angle of NO2+
Answer:
180⁰ bond angle
Explanation:
if a electron is removed from NO², you get the NO²+
it is isoelectronic with CO², having two N=O. Double bonds and nonunpaired electrons, so repulsion between the 2 refions of electron density is minimised but the 180⁰ bond angle, and it is linear , as wirht CO ²
Step 3: Apply the scaling factor to the empirical formula. The scale factor is 5 and the empirical formula is CH2O.
What is the molecular formula?
C?H?O?
The molecular formula is (CH2O)5 when the scale factor is 5 and the empirical formula is CH2O.
Considering the question given above, the following data were obtained:
Empirical formula is CH₂O
Molar mass of compound = 150 g/mol
Scaling factor (n) =?
Empirical formula × n = molar mass
[CH₂O]n = 150
[12 + (2×1) + 16]n = 150
[12 + 2 + 16]n = 150
30n = 150
Divide both sides by 30
n = 5
Therefore, the scaling factor is 5
A scale factor is a ratio between corresponding measurements of an object and a representation of that object.In chemistry, the empirical formula of a chemical compound is the simplest whole-number ratio of atoms present in a compound. .Learn more about empirical formula at:
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Answer:
C 5 H 10 O 5
Explanation:
Which part of Earth experiences physical weathering? (1 point)
crust
mantle
inner core
outer core
Answer:
crust
Explanation:
it is on the outside so it is exposed to physical weathering
The part of the Earth that experiences physical weathering is the crust. Therefore, option (A) is correct.
Physical weathering is when rocks and minerals break down through mechanical means, but their chemical make-up doesn't change. The topmost layer of the Earth, called the crust, is changed by things like temperature changes, friction, frost action, and the actions of wind, water, and ice.
These things can crack, break, and erode rocks, causing them to break up physically into smaller pieces without changing their chemical makeup. The Earth's mantle, inner core, and outer core, on the other hand, are not directly visible to the surface and do not go through the same physical processes that cause the crust to break down.
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Two different atoms have nine protons each and the same mass. However, one is neutral while the other has a negative charge. Describe what each atomic structure could be, listing the possible number and location of all subatomic particles.
Two different atoms have nine protons each and the same mass. However, one is neutral while the other has a negative charge then the atomic structure of the both atom are of same element but one of them is electrically neutral and other has a stable electronic configuration
An atom is said to be neutral because it has an equal number of electron and proton in it and if two different atom have nine proton each and same the mass but one is neutral while the other has a negative charge and the mass of an atom is determined by the number of proton and neutron is present in its nucleus and since both the given atom have 9 proton and the same mass and they must also have the same number of neutron
This implies both the atom have the same nucleus but different charges so it can be concluded that they both the atom of the same element but one of them is electrically neutral and other has stable electronic configuration
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Please answer for my final ASAP
The table below shows the average wind speeds of four hurricanes in Florida.
Florida Hurricanes
Hurricane Average Wind Speed
(miles per hour)
A 160
B 95
C 140
D 103
Which hurricane most likely caused the greatest damage?
The hurricane that will most likely caused the greatest damage is option A: 140.
What is category 5 hurricane?It is one whose speed is 157 mph or more - There will be catastrophic damage: With complete roof failure and wall collapse, a significant portion of frame homes will be lost. Residential areas will be cut off by downed trees and utility poles. Power outages could linger for several weeks or even months. For several weeks or months, the majority of the area won't be habitable.
The most destructive storms are those in category 5, which have sustained winds of at least 157 mph.
Therefore, here, there is complete roof failure and wall collapse, a significant portion of frame homes will be lost. Residential areas will become isolated by downed trees and power lines. Power outages could linger for several weeks or even months.
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What is the molar mass of an element that has a mass of 10.4 grams and contains
0.129 moles?
Br
As
Se
K
Answer:
Explanation:
10.4/.129=80.6201 find the Atomic weight of which element has approx. 80.6201
Br has an atomic number that is closest at 79.904
A curry chicken soup recipe calls for you to combine all of the main ingredients, seasonings, in 5 cups (1175 g) of chicken broth (Cs = 3.60 J/gx°C) simmering at 90.0°C until the potatoes are tender.
Coconut milk (Cs = 3.98 J/gx°C), which is initially at 25.0 °C, is added and stirred until mixed.
How many grams of coconut milk was added if the final temperature of the soup was found to be 72.0 °C?
(Answer to a whole number and don't forget your units)
The amount of coconut milk added if the final temperature of the soup was found to be 72.0 °C is 430g
The amount of coconut milk added can be found using the equation:
m₁C₁ΔT₁ = m₂C₂ΔT₂
Where m is the mass, C is the specific heat, and ΔT is the change in temperature.
In this equation, m₁ is the mass of the coconut milk, C₁ is the specific heat of the coconut milk, ΔT₁ is the change in temperature of the coconut milk, m₂ is the mass of the soup, C₂ is the specific heat of the soup, and ΔT₂ is the change in temperature of the soup.
We are given the specific heat of the coconut milk and the soup, the change in temperature of the soup, and the final temperature of the soup. This allows us to solve for the mass of the coconut milk, which is m₁.
m₁ = m₂C₂ΔT₁/C₁ΔT₂
m₁ = (1175 g)(3.60 J/g°C)(72.0°C - 90.0°C)/(3.98 J/g°C)(72.0°C - 25.0°C)
m₁ = -427 g
This answer is impossible because the mass of a substance cannot be negative. By solving it in other means we get,
The amount of coconut milk added can be found using the equation
ΔQ = mCΔT
ΔQ is the heat transfer, m is the mass, C is the specific heat, and ΔT is the change in temperature.
We are given the specific heat of coconut milk (Cs = 3.98 J/g°C), the initial temperature of the coconut milk (25.0°C), the final temperature of the soup (72.0°C), and the heat transfer of the soup (ΔQ = 1176 * 3.6*47 = 81168 Joules).
Therefore, the equation becomes:
81168 = m(3.98)(47)
m = 81168 / (3.98 * 47)
m = 81168 / 189.06
m = 429.6 grams
The amount of coconut milk added was 429.6g which could be rounded off as 430g
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in another experiment, dilute sulfuric acid is titrated with 0.100mol dm-3 sodium hydroxide solution.
2NaOH + H2SO4 = Na2SO4 + 2H2O
26.60cm^3 of dilute sulfuric acid is needed to neutralise 25.00cm^3 of the sodium hydroxide solution.
Calculate the concentration of the dilute sulfuric acid in mol dm-3
The concentration of the dilute sulfuric acid is 0.047 mol dm-3.
What is a neutralization reaction?We know that a neutralization reaction has to do with the kind of reaction that occurs between an acid and a base. The acid is made to react with the base and the product of the reaction would be salt and water only. We can now be able to find the concentration of the dilute sulfuric acid in mol dm-3 form the procedure that have been laid down below.
Concentration of the base [tex]C_{B}[/tex] = 0.100mol dm-3
Volume of the base [tex]V_{B}[/tex]= 25.00cm^3
Concentration of the acid [tex]C_{A}[/tex] = ?
Volume of the acid [tex]V_{A}[/tex] = 26.60cm^3
Number of moles of the acid [tex]N_{A}[/tex] = 1
Number of moles of the base [tex]N_{B}[/tex] = 2
Now;
[tex]C_{A}[/tex] [tex]V_{A}[/tex]/ [tex]C_{B}[/tex] [tex]V_{B}[/tex] = [tex]N_{A}[/tex]/ [tex]N_{B}[/tex]
[tex]C_{A}[/tex] = 0.100mol dm-3 * 25.00cm^3 * 1/26.60cm^3 * 2
[tex]C_{A}[/tex] = 2.5/53.2
[tex]C_{A}[/tex] = 0.047 M
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Plants that make edible fruits take advantage of which 2 benefits of this method of seed dispersal?
A. bees only pollinate flowers that will turn into edible fruits
B. seeds are often deposited in a pile of fertilizer
C. animals destroy the seeds
D. seeds are carried away from the parent plant
PLEASE HELP
Which statement best describes a concern with using fossil fuels? Responses A greater supply of fossil fuels is needed to have a positive impact on the environment. A greater supply of fossil fuels is needed to have a positive impact on the environment. Burning fossil fuels has a negative impact on the environment. Burning fossil fuels has a negative impact on the environment. The demand for fossil fuels is diminishing. The demand for fossil fuels is diminishing. Burning fossil fuels decreases the amount of greenhouse gases in the atmosphere. Burning fossil fuels decreases the amount of greenhouse gases in the atmosphere.
The statement that best describes a concern with using fossil fuels is that burning fossil fuels has a negative impact on the environment (option B).
What are fossil fuels?Fossil fuels are fuels derived from hydrocarbon deposits such as coal, petroleum, natural gas and, to some extent, peat. These fuels are non-renewable, and their burning generates the greenhouse gas carbon dioxide.
When fossil fuels are burned, they release large amounts of carbon dioxide, a greenhouse gas, into the air. Greenhouse gases trap heat in our atmosphere, thereby, causing global warming.
This suggests that the burning of fossil fuels yields a negative impact of the environment because it causes a negative effect called global warming.
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Examine this image:
An imprint of a shoe sole on soil.
How would a forensic scientist BEST categorize this evidence?
A.
impression evidence
B.
trace evidence
C.
demonstrative evidence
D.
testimonial evidence
The way in which a forensic scientist would best categorize "An imprint of a shoe sole on soil." is as an: A. impression evidence.
The type of evidence.In Forensics, there are different types of evidence and these include the following:
Real evidenceDocumentary evidence.Trace evidence.Demonstrative evidence.Testimonial evidence.Impression evidence.What is an impression evidence?An impression evidence can be defined as a type of evidence that comprises any form of markings that are produced when a physical object (body) comes in contact with another physical object (body), thereby, leaving behind an indentation, pattern, sign, or print on its surface.
In this context, we can reasonably infer and logically deduce that an imprint of a shoe sole on a soil would be best categorized as an impression evidence because it leaves behind a pattern.
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Answer:
It's A
Explanation:
What is the name of the molecule below?
• A. 2-pentyne
O B. 2-pentene
O c. 2-pentane
• D.
pentane
Answer:
2-pentene
Explanation:
On the 2nd Carbon we see a C=C, carbon with double bonds have the suffix -ene.
Which cation shows the correct charge?
a. Mg+
b. K3+
c. Zn+
d. Ca2+
e. Na2+
Ca2+ as calcium can leave 2 electrons to have an octet config.
d. The oxidation number of iron in +3
Identify the following as ionic or covalent (Ionic-A, Covalent=B)
16. LICI
17. SOA
18. NaCl
19. CaO
20. NO
NaCl is ionic compound and CaO,NO is covalent compound.
An ionic compound is formed by ions made up of charged particles.A covalent compound is formed by sharing of electrons between two different elements.Lithium is of the smallest size in group-I so, so its polarizing power is very high so it has a covalent character.NaCl exists as an ionic compound as it is formed on basis of electrostatic attraction.NO exists as N=O which is a covalent compound due to high polarising power.CaO exists as a covalent compound due to high polarising power.Ionic compounds are formed due to electrostatic attraction and covalent compounds by sharing of electrons.
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Consider the following equilibrium system:
CH4 + H2O +energy ⇌CO + 3H2
In which of the following combinations will both stresses shift the equilibrium to the right? explain.
A) A decrease in temperature and a decrease in volume
B) A decrease in temperature and a increase in volume
C) An increase in temperature and a decrease in volume
D) An increase in temperature and an increase in volume
Answer:D. an increase in temperature and an increase in volume
Explanation: Heat is a reaction, so if you increase the temperature of the system, you increase the amount of reactants. Thus, higher temperature would push equilibrium toward the products, the right. The products, however, have 4 molecules in comparison to the reactants’ 2, and so you have to increase the volume to push equilibrium that way as well.
If 18.5 g of NaOH is added to 0.800 L of 1.00 M Zn(NO₃)₂, what mass in grams of Zn(OH)₂ will be formed in the following precipitation reaction? 2 NaOH(aq) + Zn(NO₃)₂(aq) → Zn(OH)₂ (s) + 2 NaNO₃ (aq)
The mass of the zinc II hydroxide produced is 22.77 g.
What is stoichiometry?It is common that we use the stoichiometry of a reaction to be able to obtain the parameters that have to do with the reaction. In his case, we already have the balanced reaction equation of this reaction and this is our basic stock in trade for the task that is ahead of us.
Now we have; 2 NaOH(aq) + Zn(NO₃)₂(aq) → Zn(OH)₂ (s) + 2 NaNO₃ (aq)
Number of moles of the sodium hydroxide = 18.5 g/40 g/mol = 0.46 moles
Number of moles of the zinc II nitrate solution = 1.00 M * 0.800 L = 0.8 moles
If 2 moles of the sodium hydroxide reacts with 1 mole of the zinc II nitrate
0.46 moles of the sodium hydroxide reacts with; 0.46 moles * 1 mole/ 2 moles
= 0.23 moles
Hence the sodium hydroxide is the limiting reactant.
Thus;
2 mole of sodium hydroxide produces 1 mole of zinc II hydroxide
0.46 moles of sodium hydroxide produces 0.46 moles * 1 mole/2 moles
= 0.23 moles
Mass of the zinc II hydroxide = 0.23 moles * 99 g/mol
= 22.77 g
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Which of the following reactions demonstrates a synthesis reaction?
A. Zn + 2HCl > ZnCl2 + H2
B. C+02 > CO2
C. Mg + H2SO4 > MgSO4 + H2
D. 2NaCl > 2Na + Cl2
Option is the right response because it indicates a synthesis reaction (D) 2Na+Cl2 > 2NaCl.
What is a Synthesis Reaction?Synthesis reactions are those that take place when two distinct molecules or atoms interact to create a new chemical or molecule. Whenever a synthesis reaction takes place, energy is often released, as well as the process is exothermic. whenever two or more components (compounds or elements) mix to create a new product, a compound having new qualities. They synthesize to create a new material, which is why the process is known as a synthesis.
Why is synthesis reaction important and its functions?Bonds connecting two substances are formed during synthesis reactions. As a result, you may want to think about synthesis reactions as processes that help your body create things. Because of this, we can see that synthesis reactions are crucial for both body growth and tissue healing.
A descriptive statement over ranges of selected variables for input and output is the basis for functional synthesis (FS), which tries to produce an implementation. As is customary, FS tasks were formulated as "all exists" equations, wherein input variables are quantified across the board & output variables are quantified existentially.
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Answer:
C+02 > CO2
Explanation:
hope this helps-
Evan is told by the police officer, “You have the right to remain silent.” What is MOST likely happening?
A.
Evan is being issued a subpoena.
B.
Evan is being served a search warrant.
C.
Evan is being read his Miranda rights.
D.
Evan is about to testify in a criminal case.
The words "You have the right to remain silent.” means Evan is being read his Miranda rights, option C.
What are Miranda rights?Miranda rights are warnings issued by law enforcements to individuals in custody to protect their rights as part of the criminal procedure rule. These rights were created in 1966 consequently by the Miranda vs Arizona supreme court case.
The Miranda warning contains the words "You have the right to remain silent. Anything you say or do may be used against you in the court of law. You have the right to an attorney.” When the police officers read this to Evan, it was his Miranda rights.
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What is TRUE about luminol?
A.
It will turn pink in the presence of blood.
B.
It must be diluted with water to work.
C.
It cannot be used on blood that has been diluted.
D.
It doesn’t affect the DNA of a substance.
The true about the luminol is it does not affect the DNA of the substance.
Luminol is a type of chemical which does not affect the DNA of the substance. luminol is used in forensic test by the forensic scientist. luminol solution will react with blood and produce the light. luminol chemical is sensitive to blood. in forensic test luminol is used to detect the amount of blood at the crime scene. it will react with the iron in the hemoglobin. luminol is insoluble in water.
Thus, The true about the luminol is it does not affect the DNA of the substance.
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3) A gas has a volume of 100.0 mL at 700mmHg and 10 DC. What is the new volume at STP?
Ideal gas law is valid only for ideal gas not for vanderwaal gas. Combined Boyle's and Charles' gas law is used here. Therefore the new volume of gas is 88.7L.
What is ideal gas equation?Ideal gas equation is the mathematical expression that relates pressure volume and temperature.
Mathematically the relation between Pressure, volume and temperature can be given as
PV=nRT
where,
P = pressure of gas
V= volume of gas
n =number of moles of gas
T =temperature of gas
R = Gas constant = 0.0821 L.atm/K.mol
Combining Boyle's and Charles' gas law
P₁V₁/T₁ = P₂V₂/T₂
{ (0.92atm) (100 ml)} ÷283K ={ (1 atm) (V₂)} ÷273 K
V₂ = 88.7L
Therefore the new volume of gas is 88.7L.
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What does the study of analytical chemistry include? • Blood • Organic Compounds and Elements • Crystal Structures •Biological Compounds
The study of analytical chemistry includes Crystal Structures of matter. Therefore, option (C) is correct.
What is analytical chemistry?Analytical chemistry can be described as the studies and uses of instruments and methods to identify, separate, and quantify matter. In practice, identification, or quantification can constitute the analysis or be combined with another method.
Qualitative analysis is related to identifying analytes, while quantitative analysis determines the amount or concentration. Analytical chemistry contains classical chemical methods and instrumental methods.
Classical qualitative methods are used for separations such as precipitation, distillation, and extraction. Identification is based on differences in odor, color, melting and boiling point, solubility, radioactivity, or reactivity.
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As the dry bulb temperature increases with a constant temperature difference, what happens to the relative humidity?
pls help
As the dry bulb temperature increases with a constant temperature difference, the relative humidity increases.
The independent variable is the temperature of the dried bulb. The position of the sun in the sky or any other heat source that is accessible will determine it. The temperature of the dry bulb, along with the volume of water present in the air, together determine the relative humidity.The usual temperature is DBT, or the dry bulb temperature. WBT is the temperature at which an amount of air is isentropically (at constant entropy) and isobarically (at constant dry air pressure) pushed to absorb moisture. As a result of these conditions, the resultant process is isenthalpic (at constant energy - No heat exchange with the surroundings). The water that is in contact with the air during this process must evaporate in order to absorb the moisture. The latent heat of vapourization is required for evaporation.To learn more about evaporation visit:
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A 53.5 mL sample of an 5.4 % (m / v) KBr solution is diluted with water so that the final volume is 205.0 mL Express your answer to two significant figures and include the appropriate units
From the dilution formula, the final concentration of the solution is 1.4 %.
What is the final concentration?The final concentration is the concentration at the end of the dilution. We know that dilution is the process by which we add more water to the solution.
Now we have the following;
Initial concentration C1 = 5.4 %
Initial volume V1= 53.5 mL
Final concentration C2= ?
Fina volume V2= 205.0 mL
C1V1 = C2V2
C2 = 5.4 * 53.5/205.0
C2 = 1.4 %
Hence, we have a solution that would have a final concentration of 1.4 %.
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What is the pH of a 0.81 M solution of methylammonium iodide?
The pH of a 0.81 M solution of methylammonium iodide is 0.092.
How to calculate pH?pH is a figure expressing the acidity or alkalinity of a solution on a logarithmic scale on which 7 is neutral, lower values are more acid and higher values more alkaline.
The pH of a substance or solution can be calculated by using the following expression;
pH = - log {H}
Where;
H = concentration of acidAccording to this question, 0.81M is contained in a solution of methylammonium iodide.
pH = - log {0.81}
pH = 0.092
Therefore, 0.092 is the pH of the methylammonium iodide.
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A photon has a frequency of 8.6 × 10⁸ Hz. What is the energy of this photon?
Consider the combustion reaction between 25.0 mL of liquid methanol (CH3OH; d = 0.850 g/mL) and 12.5 L of oxygen gas measured at STP. The products of the reaction are CO2 (g) and H2O (g). Calculate the volume of liquid H2O formed if the reaction goes to completion and you condense the water vapor. (Assume that the density of water is 1.00 g/mL)
The volume of the water produced is obtained as 0.01422L.
What is the volume of water formed?We know that a combustion reaction is one in which a substance is burnt in oxygen. When we burn the substance in oxygen, heat is evolved and this can be seen as a change in the temperature of the system.
Now;
We must find the number of moles of each of the reactants so that we can be able to determine the limiting reactant.
Volume of methanol = 25.0 mL
Density of methanol = 0.850 g/mL
Mass of methanol = Density * volume
= 0.850 g/mL * 25.0 mL
= 21.25 g
Number of moles of methanol= 21.25 g/32 g/mol
= 0.66 moles
Volume of oxygen = 12.5 L
If 22.4 L of oxygen is occupied by 1 mole
12.5 L is occupied by 12.5 L * 1 mole/22.4 L
= 0.59 moles
If 2 moles of methanol reacts with 3 moles of oxygen
0.66 moles of methanol reacts with 0.66 moles * 3 moles/2 moles
= 0.99 moles
Hence oxygen is the limiting reactant.
If 3 moles of oxygen produces 4 moles of water
0.59 moles of oxygen produces 0.59 moles * 4 moles/ 3 moles
= 0.79 moles
Mass of water = 0.79 moles * 18 g/mol = 14.22 g
Volume of the water = mass/density
= 14.22 g/1.00 g/mL
= 14.22 mL or 0.01422L
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As you move down a group the electronegativity of an element will
Consider the following equilibrium system:
2HI ⇌ H2 + I2
At constant temperature and volume, more I2 is added to the above equilibrium. A new state of equilibrium results from a shift to the:
A) Left with a net decrease in [H2]
B) Left with a net Increase in [H2]
C) Right with a net decrease in [H2]
D) Right with a net increase in [H2]
Consider the following equilibrium system:
2HI ⇌ H₂ + I₂ At constant temperature and volume, if the more I₂ is added to the above equilibrium. The equilibrium results from shift to : left with a net decrease in [H₂].
The balanced reaction is given as :
2HI ⇌ H₂ + I₂
if we add more I₂ in the given equilibrium , then equilibrium will to left side and with the net decreases of [H₂]. the production HI increase.
Thus, Consider the following equilibrium system:
2HI ⇌ H₂ + I₂ At constant temperature and volume, if the more I₂ is added to the above equilibrium. The equilibrium results from shift to : left with a net decrease in [H₂].
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