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A gas is at 1 atm pressure with a volume...

A gas is at 1 atm pressure with a volume `800 cm^(3)`. When `100 J` of heat is supplied to the gas, it expands to `1L` at constant pressure. The change in its internal energy is

A

`80 J`

B

`-80 J`

C

`20 J`

D

`-20 J`

Text Solution

Verified by Experts

The correct Answer is:
A
Work done by the gas, at constant pressure
`DeltaW = PDeltaV`
`=(1xx10^(5)Nm^(-2))(1000-800)xx10^(-6)m^(3)=20J`
`DeltaU = DeltaQ-DeltaW`, so, `DeltaU=100J-20J = 80J`.
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