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i) change 12 kg of ice at -5oC to water at 0oC.
(ii) change 12 kg of water at 0oC to steam at 100oC
(take specific heat capacity of ice and water as 2100j/kgK and 4200 j/kgK respectively and specific latent heat of fusion of ice = 336,000 j/kg, specific latent heat of vaporization of water = 2,260,000j/kg)
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