Physics - Heat & Thermo Question with Solution | TestHub

Two moles of helium gas is mixed with three moles of hydrogen molecules (taken to be rigid). What is the molar specific heat of mixture at constant volume?$\left(\mathrm{R}=8.3\mathrm{ }\mathrm{J}/\mathrm{m}\mathrm{o}\mathrm{l}\mathrm{ }\mathrm{K}\right)$