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Q.

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

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a

167 R

b

237R

c

7R16

d

R

answer is D.

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Detailed Solution

Cv for hydrogen = 5R2, Cv for helium = 3R2

Cv for water vapour = 6R2

∴  [Cv]mix = 4×5R2+23R2+1×3R4+2+1 = 16R7

∴  Cp+Cv+R = 16R7+R = 23R7

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