Question

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. -30J C. 5kJ D. 25J Select the correct answer from above options

Answer 1

Correct Answer - B A gas expands against a constant external pressure is irreversible process. The work done in irreversible process = − P e x t △ V = = − P e x t ( V 2 − V 1 ) = = − 2 ( 0.25 − 0.1 ) = = − 2 × 0.15 = bar − L / L - -bar = − 30 × 100 J = = − 30 J = and work done by the gas is + 30 J +