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If 21 J of heat energy is supplied to an...

If 21 J of heat energy is supplied to an ideal diatomic gas at constant pressure, then the change in its energy is

A

10 J

B

12 J

C

15 J

D

18 J

Text Solution

Verified by Experts

The correct Answer is:
C
`Q=n C_(p) DeltaT`
`rArr 21 n(7)/(2) R DeltaT` `Delta U=(5)/(2)n R DeltaT`
`DeltaU=(5)/(2)xx6=15 J`
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