Four moles of hydrogen, 2 moles of helium and 1 mole of water vapour form an ideal gas mixture. What is the molar specific heat at constant pressure of mixture?

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167R

7R16

237R

answer is D.

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Detailed Solution

Cv for hydrogen = 5 R/2, Cv for helium = 3R/2, Cv for water vapour = 6R/2∴ Cvmix =4×5R2+23R2+1×3R4+2+1=16R7∴ Cp=Cv+R=16R7+R=23R7

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