Consider a mixture of $n$ moles of helium gas and $2 n$ moles of oxygen gas (molecules taken to be rigid) as an ideal gas. Its $\frac{\mathrm{C}_{\mathrm{P}}}{\mathrm{C}_{\mathrm{V}}}$ value will be
A$\frac{67}{45}$
B$\frac{19}{13}$
C$\frac{23}{15}$
D$\frac{40}{27}$
JEE MAIN 2020, Medium
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B$\frac{19}{13}$
b $\frac{C_{P}}{C_{V}} \operatorname{mix}=\frac{n_{1} C_{P_{1}}+n_{2} C_{P_{2}}}{n_{1} C_{V_{1}}+n_{2} C_{V_{2}}}$
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