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2 mol He is mixed with 2 gm of H(2). Th...

`2 mol` `He` is mixed with `2 gm ` of `H_(2)`. The molar heat capacity at constant pressure for the mixture is

A

`(17R)/(6)`

B

`(11R)/(6)`

C

`4R`

D

`(3R)/(2)`

Text Solution

Verified by Experts

The correct Answer is:
A
`C_(P_(1))` for 'He' `= (5)/(2) R, C_(P_(2)) " for " H_(2) = (7)/(2) R`
`n_(He) = 2, n_(H_(2)) = 1`
`C_(P) = (n_(1) C_(P_(1)) + n_(2) C_(P_(2)))/(n_(1) + n_(2)) = (2 xx (5)/(2) R + 1 xx (7)/(2) R)/(3)`
`= (17R)/(6)`
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