Qstnid -51- 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) - Previous Year Paper Year:2017 - Neet-xii-chemistry

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NEET-XII-Chemistry

Previous Year Paper year:2017

with Solutions - page 4

Qstn# 51 Prvs-Qstn Next-Qstn

#51
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)
(1) -30 J (2) 5 kJ
(3) 25 J (4) 30 J
digAnsr: 1
Ans : ( 1 )
Sol. ∴ W
irr
= - P
ext
▵V
= - 2 bar × (0.25 - 0.1) L
= - 2 × 0.15 L-bar
= - 0.30 L-bar
= - 0.30 × 100 J
= - 30 J