Thermodynamics Question 224

Question: When an ideal monoatomic gas is heated at constant pressure, the fraction of the heat energy supplied which increases the internal energy of the gas is

Options:

A) 2/5

B) 3/5

C) 3/7

D) 5/7

Show Answer

Answer:

Correct Answer: B

Solution:

[b] By first law, ΔQ=ΔU+ΔW

=f2nRT+PdV=f2nRT+PV

ΔQ=f2nRT+nRT=32nRT+nRT=52nRT

Fraction=(3/2)nRT(5/2)nRT=35



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