The molar heat capacity, $C_{v}$ of helium gas is 3/2 R and is independent of temperature. For hydrogen gas, $C_{v}$ approaches 3/2 Rat very low temperature, equals 5 / 2 R at moderate temperatures and is higher than 5 / 2 R at high temperature. Choose the correct reason for the temperature dependence of $C_{v}$ in case of hydrogen:

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Hydrogen is diatomic so at high temperature rotational and vibrational motion are not counted.

Can't be defined.

Hydrogen is diatomic so at high temperature rotational and vibrational motion also counts.

Hydrogen is monoatomic so at high temperature rotational and vibrational motion also counts.

answer is A.

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Detailed Solution

Molar heat capacity does not depends on the temperature.

Hydrogen is diatomic so at high temperature rotational and vibrational motion are counts.

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