CBSE Class 11-science Answered
Molar specific heat capacity of a gas refers to the amount of energy required for 1 mole of a substance to raise its temperature by 1 K. In the temperature beyond 70 kelvin, rotational motion of H2 gas starts. So at 250 K < T < 750, the number of degrees of freedom becomes five -2 rotational and 3 translational
Therefore, Cv =f/2 R becomes, Cv = 5/2 R. For lower temperatures only translational degrees of freedom will exist and no rotational freedom.
Therefore, Cv = 3/2 R.
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