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Q.

A 3 mole sample of a triatomic ideal gas at 300 K is allowed to expand under adiabatic reversible condition from 5 L to 40 L. The value of DH is 

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a

–10.24kJ

b

–12.46kJ

c

–24.62kJ

d

–14.965kJ

answer is B.

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Detailed Solution

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For triatomic gas γ=1.33,Cp=4R

T2=T1V1V2γ-1=30054013=300×12=150

 DH=n′CpT2−T1=3×4×8.314(150−300)=−14.965kJ

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