Physical and chemical laws describing the properties and behavior of gases.

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The relationships between n , T , P , V for a gas?

The symbols : T : temperature // V : volume // P : pressure // n : number of mole what it is clearly known about the relationship between one another is : P is inversely proportional to V ( from ...
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3answers
38 views

What is the partial pressure of oxygen in this mixture of oxygen and argon?

A $19.3\:\mathrm{g}$ mixture of oxygen and argon is found to occupy a volume of $16.2\:\mathrm{L}$ when measured at $675.9\:\mathrm{mmHg}$ and $43.4\:\mathrm{^\circ{}C}$. What is the partial ...
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A 1.00 L gas at 100. °C and 500. torr contains 70.0 % He and 30.0 % Ne by mass. What is the partial pressure of He?

A $1.00~\mathrm{L}$ gas at $100~^\circ\mathrm{C}$ and $500~\mathrm{torr}$ contains $70.0\%~\ce{He}$ and $30.0\%~\ce{Ne}$ by mass. What is the partial pressure of $\ce{He}$? My answer is ...
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25 views

What is the relationship between pressure and stoichiometry ratios

This is the question from the textbook. Ozone O3 can be prepared in the laboratory by passing an electrical discharge through oxygen gas. Assume that an evacuated steel vessel with a volume of 10L ...
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40 views

What are the units for m in the average kinetic energy formula?

For the equation $E_k=\frac{1}{2}mu^2$ what does the $m$ variable represent? I would say mass but the textbook does not say explicitly that it is anything.
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29 views

Henry's Law with varying temperature

I am trying to determine what the derived partial pressure would be for CO2 in the global atmosphere from historical inconstant temperatures and CO2 concentrations of the global atmosphere: Is it ...
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1answer
56 views

Justify the rearrangement of the ideal gas law

For example, lets say we have a question where we have to use the ideal gas law and lets say that moles and temperature are constant. Then the gas law can also be written as $$n\mathcal{R}T=PV.$$ ...
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1answer
39 views

What is the mass of 1 Liter of ethylene at 2000 bar pressure?

I was wondering the weight of 1 liter of ethylene at 2000 bar and 310 Kelvin? I have tried to just multiply the weight at 1 bar with 2000 but I don't think i got the correct answer because the answer ...
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1answer
16 views

Does Le Chatelier's principle apply to the gas inside an air mattress?

While sleeping on an air mattress yesterday a thought occurred to me. I had to re-inflate the air mattress since it was getting rather low and after it had a good stiffness to it, I went to sleep. The ...
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1answer
24 views

Why can air accommodate more water when the air has a higher temperature?

The amount of water(g) that air can accommodate depends on temperature. The absolute humidity then is defined as the percentage of water to air and decreases when the temperature decreases. The ...
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48 views

How much carbonation is in one liter of commercial fountain coke-cola

From what I understand generally coke is carbonated to roughly 6.2g per liter in bottles and cans, or 3.1 volumes of CO2. I was watching this video because I was curious about how fountain soda ...
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26 views

Validity of Henry's Law for an Oxygen/Bitumen System?

Henry's Law is for a gas dissolved in a liquid and states P = kC where P is the partial pressure of the gas above the solution and C is the concentration of the gas dissolved in the liquid. The k is a ...
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118 views

Can a volume of gas be measured by change in PSI?

I had a visit from an air conditioner repairman who brought with him a tank of refrigerant. He measured the system and determined that the pressure was about 20 psi too low. So he added refrigerant to ...
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1answer
57 views

Please teach me how to solve this change in concentration over time problem

I've been going crazy with this question for the past 4 hours. I can't find much help in google cause it's not a traditional "find the velocity of the reaction" question. It's fine if you don't give ...
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1answer
44 views

What is Inversion Temperature in terms of Joule Thomson Effect? Does Critical Temperature depend upon Inversion Temperature?

I couldn't find a clear answer in my book and on the internet. Please help! Your quick response will be appreciated.
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1answer
27 views

Internal and external pressure during a gas expansion

There is a solid substance in a rigid cylinder with a piston placed on top such that the distance between the piston and the bottom of the cylinder is essentially zero, and then the substance ...
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1answer
47 views

Ideal gas law? implied volume?

Working on a practice exam. The question is ...
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125 views

How much Carbon Dioxide would be required to displace enough oxygen to prevent ignition?

In air, how much $\ce{CO2}$ would be required to prevent a match to light or a butane lighter to work? I have a basement office that is unusable because of an apparent lack of Oxygen, currently it ...
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1answer
22 views

Plotting a calibration curve for Gas-Liquid Chromatography

Textbook solution: Why aren't the points like this: (20,5) (40,10) (60,15) (a,7) then to plot the curve we use y=mx+c and then find the value of 'a'
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1answer
116 views

Convert CO₂ ppm volume to ppm weight?

I'm using a sensor that measures $\ce{CO2}$ in ppm by volume aka atmosphere. What I'm using it for is to measure $\ce{CO2}$ concentration in water which is measured in ppm by weight. This is what I ...
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3answers
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What is the carbon dioxide content of a soda can or bottle?

I sort of know how carbonated beverages are carbonated: a lot of $\ce{CO2}$ gets pushed into the liquid, and the container is sealed. There are at least two things I don't know. First, how much carbon ...
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1answer
58 views

How do I calculate the temperature of hot air in Kelvin?

The question simply says "calculate the temperature of hot air in Kelvin" on a data calculation section for this lab. We recorded: volume change on cooling = 170 mL original volume of hot air = 20 ...
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210 views

Boyle's Law of pressure and volume

Boyle's Law states that: Pressure is inversely propotional to Volume. But if we take an example of a balloon. As we fill air in it it's pressure increases but it's volume also increases. Can anyone ...
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1answer
51 views

How to do Gas Laws [closed]

A sample of gas in a balloon has an initial temperature of 5 °C and a volume of 1010L . If the temperature changes to 59 °C, and there is no change of pressure or amount of gas, what is the new ...
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1answer
130 views

How does the number of moles of gas affect the rate of effusion?

According to Graham's Law, the effusion rate of a gas is inversely proportional to the square root of the molar mass of the gas. However, consider this situation: We have 1 balloon with 1 mole of ...
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35 views

Evaporation velocity of ethanol: adding ethanol vapour to a gas mixture

I need to add a known amount of ethanol vapour to a gas mixture (He/Ar). To do that I let the mixture bubble in liquid ethanol kept at a known temperature (14 C). The system is made of a large steel ...
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90 views

What does negative pressure mean in the context of this manometer?

I have a basic question on a closed manometer: I see that in this case the pressure of gas is lower than that of the liquid, which is why the liquid is higher on the left side. Now, what I don't ...
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1answer
81 views

The air we breathe

The air we breathe is a mixture of nitrogen ($\ce{N2}$, 80%), oxygen ($\ce{O2}$, 20% inhaled, 16% exhaled) and carbon dioxide ($\ce{CO2}$, 0% inhaled, 4% exhaled) all of which may be assumed to ...
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39 views

Calculation of molar volume at certain temperatures and pressures

I was wondering are there any calculators/calculations/means of calculation of molar volume at certain temperatures and pressures that don't use the Ideal Gas Law? i.e. The calculation of molar ...
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1answer
77 views

Is it possible to use diatomic carbon to utilize a new type of fuel that takes away the waste product of carbon dioxide being released into the air? [closed]

These days, we as a community what to polish and make our world a greener environment. I found a way to accomplish this task, however I don't know if it is applicable. I am wondering if the use of ...
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1answer
81 views

Ideal Gas Problem

When I work through the following problem it is unclear to me why 0.00120 mmHg is converted to 0.00332 mmHg. "What is the temperature of 0.00332 g of Hg in the gas phase with pressure of 0.00120 ...
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170 views

Is there a hydrophobic gas?

I am looking into the subject of water repelling and have been led to the hydrophobic subject area. I have two questions regarding this subject. Is there a hydrophobic gas ? If a hydrophobic ...
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1answer
77 views

Thermodynamics Problems!

A cylinder, 0.5m long and of cross section S, closed at each end is fitted with a smooth thermally insulating piston, so as to contain gas in each end A and B. Initially, the piston is in equilibrium ...
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1answer
63 views

Ideal gas derivations

For an ideal gas, how can someone obtain this: $$ \bar{V}dP = RdT- P \bar{dV}$$ from which it can de deducted, that for a constant temperature $$ \frac{dP}{\bar{dV}} = -RT $$
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343 views

Doubt regarding dimensions in van der Waal's real gas formula

In the van der Waal's formula for real gases $\left( p+\frac{a}{V^2}\right)(V-b)=nRT$, what are the dimensions of $a$ and $b$? I learnt that $a$ is related to the average force of attraction between ...
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66 views

Doubt regarding units in the ideal gas formula

I have learnt the ideal gas equation $PV=nRT$. However, I have some doubts regarding the units of the quantities in this equation. When we take the gas constant $R=8.314Jmol^{-1}K^{-1}$, what should ...
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Ideal Gas Law, P,T,V Change => adiabatic?

Given the expansion of an ideal gas, Pressure $P$, Volume $V$ and Temperature $T$ change from $P_1$, $V_1$, $T_1$, to $P_2$, $V_2$, $T_2$. a) Does the standard ideal gas law predict correct end ...
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1answer
31 views

Gas law with molecules at the same time

How many grams of oxygen are present at 25.0 C in a 5.00L tank of oxygen enriched air? The total pressure is 30.0 atm and the only other gas is nitrogen with a pressure of 17.0 atm. After converting ...
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60 views

Gas law and moles

A sample of solid magnesium reacts with excess HCl solution to form hydrogen gas The sample of gas measures 1.628 L at 22.0C and 0.930 atm pressure. a) how many moles of gas were collected? b) how ...
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115 views

Gas Law problems with stoichiometry

Consider the following reaction : $\ce{H2 + Cl2 -> 2HCl}$ A) If you have 15.00 liters of hydrogen reacting with 10.00 liters of chlorine at STP, how many liters of HCl would you produce? B) What ...
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199 views

A gas law problem to find the molar mass

A gaseous sample of a compound has a density of 0.977 g/L at 710.0 torr and 100.00C. What is the molar mass of this compound? When I worked the problem I got 29.9 g/mol is that right?
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349 views

Volume of gas needed to heat air in room

How much methane gas ($\text{cm}^3$) is required heat $150~\text{m}^3$ of air by $10~^\circ\text{C}$? Please help! I thought this wouldn't be too difficult but I've been stuck for at least an hour ...
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3k views

Isothermal vs. adiabatic compression of gas in terms of required energy

I am working on an instruction manual of sorts to be used with an introductory course in thermodynamics. As an example of problem solving, I attempt to answer the following question: If you have ...
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1answer
39 views

Specific gas constant for two gases

I have a mixture with 1 part of gas A, and 7 parts gas B. This ratio is in terms of mass. Gas Molar Mass (kg/mol) A 0.17034 B 0.034 I'm trying to find ...
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1answer
2k views

How to determine whether a compound is gas or liquid or solid?

My book says, methyl chloride, methyl bromide, ethyl chloride and some cholorofluromethanes are gases at room temperature, whereas higher members are liquids or solids. Why? With this question, I ...
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198 views

How to determine CO2 concentration from %oxygen and ppm CO

I have an excel file where it computed according to: $ \%\ce{CO2} = 20.9 - \%\ce{O2} - ppm \ce{CO}/(2*10000) $ I really can't figure out if this is correct or not? Why subtract from 20.9 and where ...
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280 views

Calculate vapor pressure from volume

For a chemistry lab, I'm required to calculate the vapor pressure of some organic solvents... methanol, ethanol, and propanol, in addition to an "unknown" sample of some solvent. In the lab, we were ...
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222 views

Sodium Hypochlorite Production Explanation

One reaction used to form sodium hypochlorite (A type of bleach) is as follows: $\ce{2NaOH(aq) +Cl2(g)->NaOCl(aq) + NaCl(aq) + H2O(l)}$ Provided the sodium hydroxide is dissolved in some ...
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1k views

Why is the carbon dioxide we exhale transparent?

Why is carbon dioxide that comes from dry ice opaque and smoky while the carbon dioxide that we exhale transparent?
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72 views

Is this relation in case of a mixture of ideal gases valid?

I came across the following relation in a book(written as a fact, with no proof), for a mixture of ideal gases both at the same pressure and temperature. The final volume of the mixture of gases ...