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Finding Final Volume - almost got it

by sisigsarap
Tags: final, volume
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Jan25-05, 12:21 PM
P: 17
Ok, here is what is given:

1.00 mol O2
Ti = 300K
Vi = 5.00L
4400 j of energy transfered by heat to the system
Vf = ?
Constant Pressure = 29.4 J/mol * K

So I set the problem up using Q = n(Constant Pressure)(Tf - T-i)
Solving for Tf I find that Tf is equal to 449.7K.

Then using equation (Vf - Vi) = (nR(Tf - Ti)) / P

Vf = ((1.00mol * 8.31 J/mol*K * 149.7K) / (1.013*10^5 N/m^2)) + 5.00L

I am getting Vf = 17.28 L

Can anyone tell me what I am doing wrong? My teacher told me the answer should be 7.52, could he of possibly meant 17.52?

Any help would be appreciated!
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Jan25-05, 12:59 PM
Sci Advisor
HW Helper
P: 11,951
1.The teacher is right.
2.The final temperature u computed is right...

3.The formula u used is wrong...

Jan25-05, 01:28 PM
HW Helper
P: 4,124
Quote Quote by sisigsarap

Constant Pressure = 29.4 J/mol * K
This is the specific heat capacity, not pressure.

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