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Question

A perfect gas goes from state A to state B by absorbing 8×105 joule and doing 6.5×105 joule of external work. If it is taken from same initial state A to final state B in another process in which it absorbed 105 J heat, then in the second process work done ?

A
On gas is 105 J
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B
On gas is 0.5×105 J
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C
By gas is 105 J
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D
By gas is 0.5×105 J
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Solution

The correct option is B On gas is 0.5×105 J
solution :
ΔQ=ΔU+ΔW
8×105=ΔU+6.5×105
ΔU=1.5×105J
by process 2
ΔQ=ΔU+ΔW
105=1.5×105+ΔW
ΔW=0.5×105J
and it is negative means work is done on the gas
hence the correct opt: B

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