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Applications of First Law of Thermodynamics

Question

Calculate $$\Delta U$$ if $$2 kJ$$ heat is released and $$10 kJ$$ work is done on the system.

A

$$12 kJ$$

B

$$8 kJ$$

C

$$-8 kJ$$

D

$$-12 kJ$$

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Solution

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Correct option is B. $$8 kJ$$
Solution:- (B) $$8 \; kJ$$
$$q = -2 \, kJ$$
$$w = + 10 \, kJ$$
$$\Delta U = q + w = -2 + 10 = +8 \, kJ$$

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