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Question

How much heat energy is released when 5.0 g of water at 20oC changes into ice at 0oC? Take specific heat capacity of water = 4.2 J g1 K1, specific latent heat of fusion of ice = 336 J g1.


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    Solution

    Heat released when 5 g water at 20°C turns to 5 g water at 0°C is,

    H1 = (5)(4.2)((20 – 0)

    => H1 = 420 J

    Heat released when 5 g of water at 0°C turns to 5 g of ice at 0°C.

    H2 = (5)(336) = 1680 J

    So, total heat released is = H1 + H2 = 2100 J


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