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A sample of tin (Cp = 0.227 J/g•°C) is placed in a freezer. Its temperature decreases from 15.0°C to −10.0°C as it releases 543 J of energy. What is the mass of the sample?

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-543 = mass Sn x specific heat Sn x (Tf-Ti)
Substitute and solve mass Sn.

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