Home Chemistry Thermodynamics and Thermochemistry Basic concepts A piston filled with 0.04 mol of an ideal ga…
Chemistry Thermodynamics and Thermochemistry Basic concepts Single Correct MCQ
Published on: August 13, 2026

A piston filled with 0.04 mol of an ideal gas expands reversibly from 50.0 mL to 375 mL at a constant temperature of 37.0 0 C. As it does so, it absorbs 208 J of heat. The values of q and w for the process will be: (R = 8.314 J/mol K) (ln 7.5 = 2.01)

A
q = +208 J, w = – 208 J
B
q = –208 J, w = – 208 J
C
q = –208 J, w = + 208 J
D
q = +208 J, w = + 208 J

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The correct answer is:
A

The process is isothermal expansion Hence, q = - w

u = 0

q = + 208 J

w = - 208 J(expansion work)

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