Work and Heat

[Temperature101]

How much work is done on a system when an ideal gas is expended adiabatically from 0.4 liters to 2.4 liters under constant pressure of 1.25 atmosphere?

A. 5
B. 2.5
C. -2.5
D. -5

I thought the answer should have been B because "work is done on a system"; therefore, work should positive...but the book (BR) says the answer is C.

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[SaintJude]

Don't know what to tell ya: work done on the system is negative. work done by the system is positive.

 

[Temperature101]

Don't know what to tell ya: work done on the system is negative. work done by the system is positive.

Thanks..I got it backwards