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Q.

1 g of a liquid is converted to vapour at 3×105 Pa pressure. If 10% of the heat supplied is used for increasing the volume by  1600 cm3 during this phase change, then the increase in internal energy in the process will be :

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a

432000 J

b

4.32 x 108 J

c

4800 J

d

4320 J

answer is B.

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Detailed Solution

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Δw = PΔV = 3 x 105 x 1600 x 10-6 = 480 J
10100(ΔQ)=480J  ΔQ=4800J

ΔU=90100(4800)=4320J

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