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0.5 mole each of two ideal gases A (C(v....

0.5 mole each of two ideal gases `A (C_(v.m)= (5)/(2)R) and B (C_(v.m)=3R)` are taken in a container and expanded reversibly and adiabtically, during this process temperature of gaseous mixture decreases from 350K and 250K. Find DH (in cal/mol) for the process

A

`-100R`

B

`-137.5R`

C

`-375R`

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
C
In case of a mixture of gas `C_(P) = (n_(1)Cp_(1) + n_(2)Cp_(2))/(n_(1) n_(2)) = ((0.5) ((7)/(2)R)+ 0.5 (4R))/(1)` = 3.75R
`Delta H = nCp Delta T = 1 xx 3.75 xx (-100) = - 375R`
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