Posted by Bria on Sunday, February 19, 2012 at 8:43pm.
You have two gasfilled balloons, one containing He and the other H2. The H2 balloon is twice the size of the He balloon (let the He balloon have a volume of 1 L and the H2 balloon. a volume of 2 L). The pressure of gas in the H2 balloon is 1 atm while that in the He balloon is 2 atm. The H2 balloon is outside in the snow (1.11oC) while the He balloon is inside a warm building (21.1oC).
a) Which balloon contains the greater number of molecules? Show calculation.
b) Which balloon contains the greater mass of gas? Show calculation.

Chemistry  DrBob222, Sunday, February 19, 2012 at 8:53pm
PV = nRT. Substitute and solve for n = number of moles. Convert to molecules remembering that 1 mol has 6.02E23 molecules.
b) n = grams/molar mass. You know n and molar mass. solve for grams and compare.

Chemistry  Bria, Sunday, February 19, 2012 at 9:03pm
Ok so for the first part I got x=0.08969 for H2 and x=0.082 for He. but how do I convert to molecules?
Working on the second part now

Chemistry  Bria, Sunday, February 19, 2012 at 9:10pm
ok so for the second part this is what I did.
0.082=x/4=0.328g
0.08969=x/2=0.179g
I feel like I have done something wrong though

Chemistry  DrBob222, Sunday, February 19, 2012 at 9:47pm
First part b. No, you didn't do anything wrong. I agree with the 0.179 for g H2 gas. I have 0.331 g for He probably because I used 0.0828 for moles. I think you rounded that or just didn't read the last digit from your calculator.
Also, on moles H2, I obtained 0.08959. I used 0.08206 for R and 273.15+(1.11) for T.
For a part, remember that 1 mol of molecules has 6.02E23 molecules. Just convert with that factor.
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