Thermodynamics Question 332

Question: 743 J of heat energy is added to raise the temperature of 5 mole of an ideal gas by 2 K at constant pressure. How much heat energy is required to raise the temperature of the same mass of the gas by 2 K at constant volume?

Options:

A) 826 J

B) 743 J

C) 660 J

D) 620 J

Show Answer

Answer:

Correct Answer: C

Solution:

[c] For constant pressure process,

Q1=nCpdTnRdT

Q2=nCvdT=n(CpR)dT=nCpdTnRdT

Q2=7435×8.3×2=660J



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