A vessel containing Hydrogen at pressure 0.068 bar, a temperature of 26°C and a volume of 3.5 m³. If the specific heat capacity of Hydrogen at constant volume is 13.3 kJ/kg K. Calculate:

The specific heat capacity at constant volume for Hydrogen is $C_v = 13.3 \text{ kJ/kg K}$.
The molar mass of Hydrogen is $M = 2 \text{ kg/kmol}$.
The universal gas constant is $R_u = 8.314 \text{ kJ/kmol K}$.

The specific gas constant is given by the universal gas constant divided by the molar mass.

For an ideal gas, the relationship between $C_p$, $C_v$, and $R$ is:

The heat capacity at constant pressure for Hydrogen is $17.457 \text{ kJ/kg K}$.