The speed of sound in hydrogen at 0°C is 1280 m s–1. The density of hydrogen at STP is 0.089 kg m–3. Calculate the molar heat capacities CP and CV of hydrogen.



Given:


The speed of sound in hydrogen at 0°C is 1280 m s–1.


The density of hydrogen at STP is 0.089 kg m–3.


At STP the pressure P is 1.013×105Pa.


So the speed of sound in hydrogen where is the density of the gas.


So, putting data in, we get,


So, ;



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