Four moles of hydrogen,two moles of helium and one mole of water vapour form an ideal gas mixture. $[C_v$ for hydrogen $= \frac{5}{2} R, C_v$ for helium $= \frac{3}{2} R, C_v$ for water vapour $= 3 R]$. What is the molar specific heat at constant pressure of the mixture?
- A$\frac{11}{3} R$
- B$\frac{23}{7} R$
- C$\frac{16}{7} R$
- D$\frac{23}{3} R$
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