He heat lost or gained by a system is related to its temperature change by a property called its heat capacity. The molar heat capacity of metals at or above room temperature equals 24.92 J K-1mol-1.

The temperature of a block of copper metal (molar mass 63.55 g mol-1) fell by 5.72 K when the copper block released 37.5 J of heat. What is the mass of the copper block?

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The heat lost or gained by a system is related to its temperature change by a property called its heat capacity. The molar heat capacity of metals at or above room temperature equals 24.92 J K-1mol-1.

The temperature of a block of copper metal (molar mass 63.55 g mol-1) fell by 5.72 K when the copper block released 37.5 J of heat. What is the mass of the copper block?

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You know that the heat capacity is 24.92 J K-1 mol-1



You know the molecular mass (atomic weight) of copper. You can, therefore, divide C by that value to get a heat capacity in grams:



Since you know the number of joules that were released, and the temperature rise, you can form an equation:



and solve for "g", the weight in grams.

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