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Latent Heat

Latent heat o...

Question

Latent heat of vaporisation of water is $540 c a l g^{- 1}$ at $100^{o} C$ . Calculate the entropy change when $1000 g$ water is converted to steam at $100^{o} C$ .

1447 c a l

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2447 c a l

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3447 c a l

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4447 c a l

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Solution

The correct option is A $1447 c a l$
$Δ S_{v a p} = \frac{Δ H_{v a p}}{T} = \frac{540 \times 1000}{373} = 1447 c a l$

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