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Change in internal energy when 4 kJ of w...

Change in internal energy when `4 kJ` of work is done on the system and `1 kJ` of heat is given out of the system is

A

`+1 kJ`

B

`-5 kJ`

C

`+5 kJ`

D

`+3 kJ`

Text Solution

Verified by Experts

The correct Answer is:
D
Change in internal energy is given by the relation,
`DeltaE=q+w`
`DeltaE=-q+w` (as heat is given out by the system)
`DeltaE=-1+4`
`DeltaE=+3kJ`.
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ERRORLESS -THERMODYNAMICS AND THERMOCHEMISTRY -ORDINARY THINKING (Objective Questions) First law of thermodynamics and Hess law
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