Molar heat capacity of a gas does not depend on

i) Its temperature                           ii) Its molecular weight  

iii) Its atomicity

Molar specific heat capacity of  a gas depends on only (i) atomicity of

molecule because atomicity provides the molecules of a gas degrees of

freedom. Which gives the gas molecules to avail energy for different

movements i.e., different forms of energies

monoatomic gas :- only one degree of freedom i.e., linear motion.

diatomic gas :- has three degrees of freedom to rotate + freedom to move linearly +  freedom to oscillate

polyatomic gas :- has three degrees of freedom

so here in the given Question we can get the molar specific heat capacities do not depend on its temperature and molecular weight