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Question

A gas expands adiabatically from 1.0 L to 12.0 L against a constant pressure of 0.75 atm. The U of the gas is 


Correct Answer
A
- 835.9 J
Your Answer
B
853.9 J
Your Answer
C
859.9 J 
Your Answer
D
- 839.5 J

Solution

The correct option is C - 835.9 J
First law of thermodynamics U=Q+W
    Q=0 (adibatic expansion)
so, U=W
U=W=pextV=(0.75 atm)(12.0 L1.0 L)
        =8.25 L atm
        (8.25 L atm)(8.314 J0.082 Latm)=835.9 J

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