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First Law of Thermodynamics

If 500 cal of...

Question

If $500 c a l$ of heat energy is added to a system and the system does $350 c a l$ of work on the surroundings, the internal energy change of the system is:

A

150 cal

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B

850 cal

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C

-150 cal

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D

-850 cal

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Solution

The correct option is A 150 cal
Heat absorbed, q = 500 cal;
Work done by the system, w = -350 cal
From the first law of thermodynamics,
$△ U = q + w = 500 + (- 350) = 150 c a l$

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First Law of Thermodynamics

Standard XIII Chemistry

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