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An ice-cube tray contains 0.350kg of water at 18C. How much heat must be removed in order to barely freeze it? You have 0.250kg of

An ice-cube tray contains 0.350kg of water at 18C. How much heat must be removed in order to barely freeze it?

You have 0.250kg of water at 75C. How many kilograms of ice at 20.0C must be dropped into the water to have a final temperature of the system be 40.0C?

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