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Calculate the number of degrees of freedom of molecules of hydrogen in 1 cc of hydrogen gas at NTP.

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Degree of freedom of H2 molecule = 3 translational degree of freedom + 2 rotational degree of freedom = 5.

Number of molecules in 1cc of hydrogen gas at NTP à 22.4 L = 22400 cc H2 gasà it has 6.023 \times 10^{23} molecules

So, 1cc of H2  gas at STP has,\frac{ 6.023}{22400}\times 10^{23} = 2.688 \times 10^{19} molecules

Hence the total degree of freedom =5 \times 2.688 \times 10^{19 }= 1.344 \times 10^{20}

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