If a gas at 10atm and 300K expands against a constant external pressure of 2atm from a volume of 10 litres to 20 litres, the amount of work done is: Given: 1 L.atm = 101.3 J
A
17L.atm
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B
10 L.atm
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C
−2026J
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D
2026J
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Solution
The correct option is C−2026J As the process is done at a constant external pressure, it is irreversible. W=−∫2010P.dV=−∫20102dV ⇒W=−2[20−10] ⇒W=−20L.atm As, 1 L.atm = 101.3 J i.e W=−20×101.3J=−2026J