A container has a mixture of two gases: n1 mol of gas 1 having molar specific heat

Question:

A container has a mixture of two gases: n1 mol of gas 1 having molar specific heat C1 and n2 mol of gas 2 of molar specific heat C2. (a) Find the molar specific heat of the mixture. (b) What If? What is the molar specific heat if the mixture has m gases in the amounts n1, n2, n3, . . . , nm, with molar specific heats C1, C2, C3, . . . , Cm, respectively?