Asked by Bria
                You have two gas-filled 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.
            
            
        a) Which balloon contains the greater number of molecules? Show calculation.
b) Which balloon contains the greater mass of gas? Show calculation.
Answers
                    Answered by
            DrBob222
            
    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.
    
b) n = grams/molar mass. You know n and molar mass. solve for grams and compare.
                    Answered by
            Bria
            
    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
    
Working on the second part now
                    Answered by
            Bria
            
    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
    
0.082=x/4=0.328g
0.08969=x/2=0.179g
I feel like I have done something wrong though
                    Answered by
            DrBob222
            
    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.
    
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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