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Q.

100 g of water is heated from 30o C to 50o C. Ignoring the slight expansion of the water, the change in its internal energy is (specific heat of water is 4184 J/kg/K)

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a

84 kJ

b

8.4 kJ

c

4.2 kJ

d

2.1 kJ

answer is A.

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Detailed Solution

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As work done =0

[ as W=pΔ Vand ΔV=0,soW=0]ΔU=mCΔT=100×10−3×4184×(50−30)=8.4kJ

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