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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`

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The correct Answer is:
A
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