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A system absorbs 100 cal of heat and doe...

A system absorbs 100 cal of heat and does an external work of 150 J. if J=4.2 J/cal the change in internal energy is

A

420 J

B

270 J

C

250 J

D

150 J

Text Solution

Verified by Experts

The correct Answer is:
B
`DeltaQ=100xx4.2`
`=420J`
`DeltaW=150J`
`DeltaU=DeltaQ-DeltaW`
`=420-150=270J`.
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