1.

The volume of a gas decreases from 500 c c to 300 c c when a sample of gas is compressed by an average pressure of 0.6 atm. During this process 10 J of heat is liberated. The change in internal energy is

Answer»

`-2.16 J`
`12.156 J`
`2.16 J`
`101.3 J`

Solution :Here: Change in
Volume (V) = 500 - 300 = 200cc = 0.2 litre,
PRESSURE (P) = 0.6 atm and HEAT LIBERATED (q) = 10 J
Work done (W) = `PDeltaV=(0.2xx0.6)=0.12` litre-atm
But 1 litre - atm = 101.3 J.
hence `W=0.12xx101.3=12.156J`.We also know that heat is liberated, therefore it would be negative. Thus change in `DeltaE=q+W=-10+12.16=2.16J`.


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