Tuesday
July 29, 2014

Homework Help: Chemistry

Posted by Tina on Sunday, October 22, 2006 at 1:31pm.

Balloon- CO2
Balloon- O2
Balloon- He
Balloon- N2
Balloon- CH4

Represented above are five identical balloons, each filled to the same volume at 25 degrees Celcius and 1.0 atmosohere pressure with the pure gases indicated.

A) which balloon contains the greatest mass of gas? explain

B) Compare the average kinetic engeries of the gas molecules in the balloons. explain.

C)Which balloon contains the gas that would be expected to deviate mose from the behavior of an ideal gas? explain.

D)12 hours after being filled, all the balloons have decreased in size. Predict which balloon will be the smallest


Balloon- CO2
Balloon- O2
Balloon- He
Balloon- N2
Balloon- CH4

Represented above are five identical balloons, each filled to the same volume at 25 degrees Celcius and 1.0 atmosohere pressure with the pure gases indicated.

A) which balloon contains the greatest mass of gas? explain

Look at PV=nRT. If P is the same, V is the same, R and T are constants (and therefore the same), then n must be the same for each gas. So calculate for a number of mols (just pick a number, such as 1) the molar mass.

B) Compare the average kinetic engeries of the gas molecules in the balloons. explain.

KE = 1/2 mv2

C)Which balloon contains the gas that would be expected to deviate mose from the behavior of an ideal gas? explain.

Deviations from ideal behavior are a function of size and attraction to other molecules. Look for the molecule that is the largest and might have some attractions to each other.

D)12 hours after being filled, all the balloons have decreased in size. Predict which balloon will be the smallest

I would look for the molecule that I thought might have the best chance of getting through the pores of the balloon walls.



For A)
wat do i plug in if they dont give me a volume.and will i get the number of moles from the PV=nRT, or is there another step?

For B)
what do i do if they dont give me a volume?



Assume any volume you wish. It doesn't matter as long as you use the same number for all of them. And there is no other step. Just use 1 for P, 22.4 for V, (although you can pick any number), use 0.08206 for R and use 273 for T. But I had envisioned you doing it simpler than that. Since the problem says the same conditions, then we know P is the same, we know V is the same, we know R is the same and we know T is the same;therefore, n (the number of mols) MUST be the same. So make it easy on yourself and pick 1 mol for n to start with. NOW, calculate the mass of 1 mol of CO2, O2, N2, He, etc etc. That will be 44 g for CO2, 32 g for O2, 28 g for N2, etc. You get the idea? Then you just compare to see which balloon has the highest mass and which the lowest mass.


I gave you the formula for KE which is 1/2*mass*velocity2. But the average KE is proportional to the temperature; that is, at the same temperature, all gases have the same average KE. The masses will be different and the speeds of the small molecules will be greater than those of larger molecules but the average KE will be the same.


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