Question

A gas (C_v,m = 5/2R) behaving ideally was allowed to expand reversibly and adiabaticaly from 1 litre to 32 litre. It’s initial temperature was 327°C. The molar enthalpy change (in J/mole) for the process is

(A) –1125 R 

(B) –575 R 

(C) –1575 R 

(D) None of these

Answer 1

Correct Answer is: (C) –1575 R 

y = 7/5

y – 1 = 2/5