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1.) How much cold water at 4.26 degree C must be added to 667 g of...

1.) How much cold water at 4.26 degree C must be added to 667 g of water at 45 degree C such that the final temperature of the mixture is 25.0 degree C? No heat is exchanged with the surroundings. Express your answer in grams.

2.) Calculate the amount of heat, in kJ, required to turn 511 g of ice at -15.30C into water at 250C.

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