The value of  γ for helium is 5/3. Calculate the specific heat capacity at constant volume, if it’s molar mass is 4:

we know that CV=3R/2=12.45 J/ mol-K for helium which is monoatomic. Therefore, specific heat capacity of gas at constant volume is cv=CvM=12.45 4=3.1125 Jgm-1K-1Cv=molar specific heat of gas at constant volumeM= molecular weightOr cv=3.1125×103 Jkg-1K-1⇒cv=3112.5 Jkg-1K-1