The molar specific heat capacity of helium at constant pressure is $20.8 \mathrm{~J} \mathrm{~mol}^{

Question

The molar specific heat capacity of helium at constant pressure is $20.8 \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{k}^{-1}$. Then molar specific heat capacity of helium at constant volume is (in $\mathrm{J} \mathrm{mol}^{-1} \mathrm{~K}^{-1}$ )\

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