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Four moles of hydrogen , two moles of he...

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?

A

`(16)/(7)R`

B

`(23)/(7)R`

C

`(19)/(7)R`

D

`(26)/(7)R`

Text Solution

Verified by Experts

The correct Answer is:
A
`C_("pmix") = (n_(1)Cp_(1)+ n_(2)Cp_(2) + n_(3)Cp_(3))/(n_(1) + n_(2) + n_(3))`
=`((4) ((7)/(2)R) + 2 ((5)/(2)R) + 1 (4R))/( 4+ 2 + 1 ) = (23)/(7)R`
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