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Under isothermal condition, a gas at 300...

Under isothermal condition, a gas at 300 K expands from 0.1 L to 0.25 L against a constant external pressure of 2 bar. The work done by the gas is (Given that 1 L bar = 100 J)

A

30 J

B

`-30 J`

C

`5kJ`

D

`25J`

Text Solution

Verified by Experts

The correct Answer is:
B
A gas expands against a constant external pressure is irreversible process. The work done in irreversible process`=-P_(ext)triangleV`
`=-P_(ext)(V_(2)-V_(1))`
`=-2(0.25-0.1)`
`=-2xx0.15` bar `-L//L`-bar
`=-30xx100J`
`=-30J`
and work done by the gas is `+30J`
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