Two moles a monoatomic gas is mixed with six moles of a diatomic gas. The molar specific heat of the mixture at constant volume is :

Question

$\frac{3}{2} \mathrm{R}$

$\frac{7}{4} \mathrm{R}$

$\frac{5}{2} \mathrm{R}$

$\frac{9}{4} \mathrm{R}$

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