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250 g of water at 30^(@)C is present in ...

250 g of water at `30^(@)C` is present in a copper vessel of mass 50 g. Calculate the mass of ice required to bring down the temperature of the vessel and its contents to `5^(@)C`.
Specific latent heat of fusion of ice = `336xx10^(3)Jkg^(-1)`
Specific heat capacity of copper vessel = `400Jkg^(-1)""^(@)C^(-1)`
Specific heat capacity of water = `4200Jkg^(-1)""^(@)C^(-1)`.

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