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Your hot chocolate is served at 90 deg Celsius, too hot to drink. How much ice...

Your hot chocolate is served at 90 deg Celsius, too hot to drink. How much ice should you add to bring it to a more reasonable temperature of 30 degrees C? The specific heat of milk is 4 J/g/deg C, the specific heat of water is 4.19 J/g/deg C, and the latent heat of fusion of ice is 334 J/g.

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