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Question

A container contains 0.25 kg of a liquid at its boiling temperature.
If the latent heat of fusion for the liquid is 500 Joules/kg and the latent heat of vaporization for the liquid is 1000 Joules/kg, how much heat must be added to the liquid to boil all of the liquid away?

A
125 J
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B
2000 J
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C
4000 J
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D
0.50 J
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E
250 J
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Solution

The correct option is D 250 J
Given : m=0.25 kg Lv=1000 J/kg
Heat required to boil all the liquid Q=mLv=0.25×1000=250 J

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