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if this is for basic physics, then the specific heat capacity of water is 1000cal/(Kg * degree centigrade). in other words, 1000 calories are released for every kilogram of water that cools 1 degree, or 1 calorie is released for every gram of water that cools 1 degree. so if 1 calorie released = 1 g...

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Q: What mass of water will give up 240 calories when its temperature drops from 80 to 68?
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