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Calculate the change in internal energy ...

Calculate the change in internal energy when 5g of air is heated from `0^(@)` to `4^(@)C`. The specific heat of air at constant volume is `0.172 cal g^(-1) .^(@)C^(-1)`.

A

28.8 J

B

14.4 J

C

7.2 J

D

3.51 J

Text Solution

Verified by Experts

The correct Answer is:
B
As constant volume , dW=PdV=P`xx`0=0
dQ = `mC_(V)DeltaT=5xx0.172xx4` cal
`=5xx0.172xx4xx4.2J`=14.4 J
dU =dQ-dW=14.4 -0=14.4 J
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