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Thermodynamic Processes

A system is g...

Question

A system is given $400 c a l$ of heat and $1000 J$ of work is done by the system, then the change in internal energy of the system will be

A

- 860 J

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B

680 e r g

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C

680 J

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D

860 J

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Solution

The correct option is C $680 J$
$1 c a l = 4.184 J, t h u s 400 c a l = 1673.6 J$ .
The change in internal energy is $Δ U = Δ Q - Δ W$
or $Δ U = 1673.6 - 1000 = 673.6 \approx 680 J$

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