STANDARDChemistry-Thermodynamics
STANDARD Chemistry Work done by gases MCQ Question
Type: MCQ-numerical-Medium-Class 11
Under isothermal conditions, a gas at 30 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
5 kJ
D
25 kJ
Correct Answer
Option B
Detailed Explanation
Expansion of a gas against a constant external pressure is an irreversible process. The work done in an irreversible process is calculated as −Pₑₓₜ ΔV = −Pₑₓₜ (V₂ − V₁) = −2(0.25 − 0.1) = −2 × 0.15 L bar = −0.30 × 100 J = −30 J.
Found an issue with this question?
Related Questions
More from
Which of the following statements about enthalpy changes in thermodynamics is correct?
(general)Physics
What is the enthalpy change associated with the atomization of dihydrogen (H2)?
(general)Physics
For a strongly endothermic reaction, what is the expected value of the equilibrium constant K?
(general)Physics