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150g of ice is mixed with 500g of water having a initial temperature of 40C. The final temperature of the mixture is 20C. The heat

150g of ice is mixed with 500g of water having a initial temperature of 40C. The final temperature of the mixture is 20C. The heat of fusion of ice is 333.5 J/g. Cp of water is 4.184 J/g C. What initial temperature of the 500g of water is required to melt 250g of ice?

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