The molar heat capacity of an ideal gas at constant volume is $\alpha R$. If $R$ is the universal gas constant,then the ratio $C_P/C_V$ is equal to ...........

The specific heat capacities of an ideal gas at constant pressure and at constant volume are $620 \ J \ kg^{-1} \ K^{-1}$ and $420 \ J \ kg^{-1} \ K^{-1}$ respectively. The density of the gas at $STP$ is approximately, (in $kg \ m^{-3}$)

The ratio of the adiabatic to isothermal elasticities of a triatomic (non-linear) gas is

Molar specific heat at constant volume,for a non-linear triatomic gas is (vibration mode neglected).

When an ideal diatomic gas is heated at constant pressure,the fraction of the heat energy supplied which increases the internal energy of the gas is:

For a gas,$R/C_V = 0.67$. What kind of molecules is this gas made of?