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Question

The heat energy required to vapourise 5kg of water at 373 K is

A

2700 K. cal

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B

1000 K. cal

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C

27 K .cal

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D

270 K. cal

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Solution

The correct option is A 2700 K. cal
Latent Heat of vapour ination $(a t 373 K)$ of water in, $L = 539 K c a l / k g$
To vapowerise $M = 5 k g$ water, heat needed:-
$Q = M L = 5 \times 539 = 2695 K c a l$

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