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Latent Heat of Vaporization

A container c...

Question

A container contains $0.25 k g$ of a liquid at its boiling temperature.
If the latent heat of fusion for the liquid is $500 J o u l e s / k g$ and the latent heat of vaporization for the liquid is $1000 J o u l e s / k g$ , 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 $L_{v} = 1000$ $J / k g$
$∴$ Heat required to boil all the liquid $Q = m L_{v} = 0.25 \times 1000 = 250$ $J$

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