Two moles of a monoatomic gas is mixed with six moles of a diatomic gas. The molar specific heat of the mixture at constant volume is: (1) $\frac { 9 } { 4 } R$ (2) $\frac { 7 } { 4 } R$ (3) $\frac { 3 } { 2 } R$ (4) $\frac { 5 } { 2 } R$
Two moles of a monoatomic gas is mixed with six moles of a diatomic gas. The molar specific heat of the mixture at constant volume is:\\
(1) $\frac { 9 } { 4 } R$\\
(2) $\frac { 7 } { 4 } R$\\
(3) $\frac { 3 } { 2 } R$\\
(4) $\frac { 5 } { 2 } R$