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

learn more… | top users | synonyms

0
votes
0answers
19 views

gas sample compressed [on hold]

Which statement explains why a oxygen sample can be compressed into a smaller container? ***i found answer i just want this deleted
0
votes
2answers
32 views

Volume of gas given off RHS with volume of gas used in one part of LHS

So I have the following equation: $$\ce{2SO2 + O2 -> 2SO3}$$ and the question: 100cm^3 of sulphur dioxide is used, what volume of sulphur trioxide is given off? Can someone please explain how I ...
-1
votes
0answers
16 views

Partial Pressure [closed]

The partial pressure of water at 298 K is 23 mbar in our atmosphere. A thirsty explorer wants to condense water vapour in the air to drink. What is the minimum volume of air he needs to work with to ...
0
votes
0answers
23 views

Ideal Gas Law Question [closed]

$870\ \mathrm{cc}$ of moist hydrogen is measured at $\mathrm{9\ C^\circ}$ and $659\ \mathrm{mm}$ pressure. Find its volume at normal temperature and pressure. The vapour pressure of water at ...
0
votes
0answers
27 views

Number of moles in the gaseous mixture [closed]

A vessel contains equal number of moles of methane and helium.Due to a hole in the mixture one fourth of the gaseous mixture effused out.What is the ratio of number of moles of remaining methane and ...
1
vote
0answers
26 views

Why does O2 gets less compressed as compared to CH4 when pressure is applied

As I understand that the compression depends on the attractive forces between the molecules. And considering that both $\ce{O2}$ and $\ce{CH4}$ dont have any dipole-dipole interaction with their ...
1
vote
1answer
25 views

Specific Heat affected by Pressure

I know the specific heat depends (slightly) on the conditions present. For example, methane's specific heat is 2.5 at 400 K, but 4.5 at higher temperatures. How might specific heat depend on ...
0
votes
0answers
20 views

Maxwell Speed Curves for Gases

Can someone explain me why is this working. Why are we rotating at same speeds ? Aren't many molecules not passing ? How can the detector tell which are fast and which are slow ?
0
votes
0answers
13 views

How to calculate the gas pressure of HCl over a saturated CuCl2 solution

I have a concentrated solution of $\ce{CuCl2}$ ($<200~\mathrm{ml}$, surface area $2100~\mathrm{cm^2}$). I saw a note about protecting metal equipment from $\ce{HCl}$ attack in the room ...
0
votes
1answer
21 views

Boyle's Gas Law Questions

Q1. If 1.00L of oxygen gas at 1.00 bar pressure is combined with 1.00L of nitrogen gas at 1.00 Bar pressure in a 2.00L vessel, what is the total pressure in the vessel? a) 0.50 bar b) 1.00 bar c) ...
0
votes
0answers
18 views

Can you derive a formula for any internal energy of a gas as long as you know the degree of freedom?

I have the following formula that I derived from studying my textbook that generalizes to all ideal gases: Monoatomic molecular gases ($\ce{He, Ne}$ etc.) Degree of freedom: 3 $\ce \frac{3}{2}nRT = ...
3
votes
1answer
51 views

How does Carbon Dioxide have a degree of freedom of 6?

Carbon Dioxide has a degree of freedom of 6, yet from what I understand, it is a linear molecular shape. Therefore, the number of axis of linear movement is 3 (x,y,z) but there are only two axis of ...
1
vote
0answers
31 views

How much CO2 is produced by plant litter?

I made measurements of CO2 formed during decomposition of dead plant material using gas spectrometer. It gives the results of CO2 in ppm. How do I convert it to $\large \rm \frac{mg~CO2}{\text{1 g ...
2
votes
2answers
34 views

Ionization Energy and Electron Affinity

This is from my textbook. But in other reference books I am using and Wikipedia, there is not any mention of absolute zero while defining Ionization Energy and Electron Affinity. What does it mean? ...
0
votes
0answers
15 views

Thermodynamics of mixture of gases and gas to liquid transformation of particular gas in mixture of gases

I am working on converting the nitrogen and sulphur dioxide from gas to liquid in the mixture of $\ce{CO2}$, nitrogen and sulphur dioxide. For continuous conversion from gas to liquid phase, I want to ...
0
votes
0answers
9 views

Polarity-specific membrane in a gas

Would it theoretically be possible to have a membrane within a gas only permeable by polar molecules? For instance, a membrane impermeable to oxygen as opposed to water vapour.
2
votes
0answers
21 views

Gas solubility in water and alcohol

I know that a certain gas is soluble in water but not in alcohol. How can I find the solubility of the gas in mixture of water and alcohol? Do I use a simple linear relation? The gas in question is ...
1
vote
0answers
27 views

Calculating the mass of air under pressure [closed]

A popular scuba tank is the "aluminum 80," so named because it can deliver 80 cubic feet of air at "normal" temperature (72F) and pressure (1.00atm) when filled with air at a pressure of 3000psi. A ...
3
votes
0answers
23 views

Arterial blood CO2 content, division and partial pressure

My lecturer cites Boron and Boulpaep's Medical Physiology (2nd edition) for the following claims: the total $\ce{CO2}$ content of arterial blood is $26.4$ mmol/L or $48\%$ v/v (not sure if these ...
0
votes
1answer
39 views

Calculating molar mass from gas data

34.05 mL of phosphorus vapour weighs 0.0625 g at 546 °C and 0.1 bar pressure. What is the molar mass of phosphorus? I tried to solve the above question and got 1249.8g. The book's answer sheet ...
0
votes
1answer
25 views

Is it possible to have an airborn fluorescent particle that reacts to lightning?

I want to measure the expansion of the atmosphere when it is heated and impacted by lightning, to have an idea of the propagation of sound waves made by lightning. To do this, the ideal would be to ...
0
votes
2answers
55 views

In the following question, why should the volume be less than 11.35L instead of greater than 11.35L?

A balloon is filled with hydrogen at room temperature. It will burst if pressure exceeds 0.2 bar. If at 1 bar pressure the gas occupies 2.27 L volume, upto what volume can the balloon be ...
-1
votes
1answer
21 views

gas volume of reactants [closed]

I am revising gas volume equations and I can figure out the volume and moles of the product when given a reactants moles however i am struggling on figuring out the mass of one reactant when i have ...
2
votes
1answer
60 views

Doubts on Diffusion/ Effusion of gases at different pressures

Let's start with a question: "One mole of nitrogen gas at 0.8 atm takes 38 s to diffuse through a pinhole, whereas one mole of an unknown compound of Xenon with flourine at 1.6 atm takes 57 s ...
1
vote
1answer
37 views

Thermodynamics : Work Done by a Gas

Suppose in a piston in which there is a gas, the gas exerts pressure P on surroundings, whereas the surrounding exerts a pressure $P[ext]$ on the gas. In order for the gas to expand, P must be ...
5
votes
1answer
55 views

Pressure of carbon dioxide due to two simultaneous equilibriums

$1~\mathrm{mol}$ each of barium carbonate and calcium carbonate are put in a closed vessel which is maintained at $300~\mathrm{K}$ temperature. Two equilibria are established, with the respective ...
1
vote
1answer
49 views

Pressure Cooker at High Altitudes and Low Altitudes

I just have a doubt if I'm right or wrong about this. Please explain more if possible. Also, I have some questions regarding boiling point and vapour pressure. High Altitude Cooking At high ...
4
votes
1answer
41 views

Real Gas Equation

When a real gas has a pressure lower than the expected value from ideal gas (because of the intermolecular force of attraction) , we have - $$P_{\text{ideal}}= P_{\text{real}} + \frac{an^2}{V^2}$$ ...
0
votes
0answers
36 views

Ideal Gas Equation for an equilibrium mixture: how to work out n number of moles

Methanol can be manufactured by the reaction of carbon monoxide and hydrogen. $$\ce{CO (g) + 2 H2 (g) <=> CH3OH (g)}$$ The equilibrium mixture contained $0.452~\mathrm{mol}$ of carbon monoxide, ...
3
votes
2answers
43 views

What causes transition from smoldering combustion to flame combustion?

What causes the transition from smoldering combustion to flame combustion? From what I have read about it is that, smoldering combustion gives off a lot of flammable gases, primarily, Carbon ...
0
votes
2answers
62 views

How would Dalton's law be affected when there are two ideal gases in a container at different temperatures?

How would Dalton's law be affected when there are two ideal gases in a container at different temperatures? Let the gas with higher temperature be gas A and the gas with lower temperature be ...
0
votes
1answer
82 views

Vapor Pressure - Sealed Vessel

I have read that vapor pressure is only affected by temperature, but all of the examples have been in a sealed vessel. I have also read that pressure does not affect vapor pressure. I am looking for ...
3
votes
1answer
36 views

Ranking gases by value of the van der Waals equation-of-state constant 'a'? [closed]

How can I find out which gas has the highest value of the van der Waals constant $a$? Example set of gases in ascending order of $a$: $\ce{NO2}$, $\ce{CO2}$, $\ce{H2}$, $\ce{H2O}$ and $\ce{CCl4}$.
2
votes
1answer
88 views

Dalton's law of partial pressure

A mixture of helium and neon gases is collected over water at $28.0 \rm~^\circ C$ and $745\rm~ mmHg$. If the partial pressure of helium is $368\rm~ mmHg$, what is the partial pressure of neon? ...
1
vote
1answer
38 views

Partial Pressure and Partial Molar Volume

When we define partial pressure and partial molar volume of a gas in a mixture, suppose $P$ is partial pressure of a gas in a mixture and $V$ is partial molar volume then why the following equation ...
1
vote
3answers
63 views

Replacing gas in a chamber

Is there a way to replace a gas (air) for example with another gas (say, helium) in a gas chamber? It does not need to be a complete replacement, but there would need to be a significant amount of the ...
7
votes
1answer
71 views

Why do some gases have lower value of Z for a particular pressure?

In the above graph,the minima of the curve for methane is more than that of nitrogen. Also, for a given value of pressure, the value of $Z$ for methane is less than that of nitrogen. They seem to ...
0
votes
0answers
36 views

Diffusion experiment to test Graham's Law

I am trying to perform this experiment to test Graham's law of effusion. http://www.rsc.org/learn-chemistry/resource/res00000682/diffusion-of-gases-ammonia-and-hydrogen-chloride?cmpid=CMP00005016 In ...
1
vote
1answer
58 views

Is tungsten gas visible?

I apologize if this isn't a sufficiently technical question to be posed in this forum. I'm planning a short story, and unfortunately I've worked in a somewhat sience-y opening. Most of the ...
1
vote
0answers
26 views

I want to work out how much methane is in a 150L tank [closed]

I want to work out how much methane is in a $\mathrm{150~L} $ tank and then see the potential energy of it. The temperature is $\mathrm{283~K}$ so I used $PV=nRT$ but do I need to know how much ...
1
vote
3answers
54 views

Liquification of gas to liquid at critical temperature

The gas that liquifies first, when cooled from 500K to its critical temperature given in parenthesis is a) $\ce{CO2}$ (304.1 K) b) $\ce{NH3}$ (405.5 K) c) $\ce{O2}$ (154.3 K) d) $\ce{N2}$ (126.0 ...
0
votes
2answers
68 views

Volume occupied by real gases

Molecules of an ideal gas are assumed to have zero volume, the volume available to them for motion is always the same as the volume of the container. In contrast, the molecules of a real gas have ...
0
votes
0answers
47 views

How do we compute the mole fraction of an ideal gas in a stream blended by mass flow controllers? For a non-ideal gas?

Consider a gas blending system consisting of two mass flow controllers, A and B, set to control flow to $f_A$ and $f_B$, respectively. Consider that flow controller A is metering the pure gas of ...
3
votes
1answer
46 views

Non-Ideal Gas Behavior

I obtained measurements of temperature and pressure at various temperatures ($-10, 0, 20, \text{ and } 50^\circ \mathrm{C}$) and plotted them on a graph. Projecting backwards, the best-fit line ...
1
vote
1answer
55 views

determine density of oxygen gas using modified ideal gas equation

I am trying to determine the density of a gas (oxygen). As the gas is a compressible fluid a modified version of the ideal gas equation is required. I have been given the following equation and I am ...
1
vote
0answers
28 views

Can Helium be scented? [closed]

Is it possible to have Helium scented? If so, can it be done in large quantities? I'm interested in using a peppermint type scent.
0
votes
0answers
38 views

combustion of natural gas and oxygen overall molar and volume ratio

I am trying to calculate molar ratio between natural gas and oxygen for the complete combustion reaction of all the fuels components. so I want to work out how much oxygen I need to natural gas. The ...
0
votes
0answers
26 views

10dm3 of N2 and a gas X at the same temperature contains the same number of molecules. The other gas is?

According to the solution on my book, the correct answer is CO as the molar mass of both N2 and CO is the same. However, doesn't Avogadro's law state that equal volumes of all gases at the same ...
3
votes
2answers
71 views

Resultant temperature of mixture

**Question: ** There are 2 flasks of equal volume, connected by a narrow tube of negligible volume, filled with nitrogen gas. When both are immersed in boiling water, the gas pressure inside the ...
1
vote
1answer
47 views

Calculating molar mass using gas laws

I have a homework question and the answer I came up with doesn't seem right. Question: A gas has a volume of $255\ \mathrm{mL}$, a pressure of $733\ \mathrm{mmHg}$, a temperature of $548\ ...