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bocause the because the penny absorbed heat from the FOR PRACTICE 6.2 To determine whether a shiny gold colored rock is actually gold, a chemistry student decides to measure its heat capacity. She first weighs the rock and finds it has a mass of 4.7 g. She then finds that upon absorption of 57.2 J of heat, the temper ature of the rock rises from 25 C to 57 C. Find the specific heat capacity of the substance composing the rock and deter. mine whether the value is consistent with the rock being pure gold by referring to 64 Table their initial tel STRATEGIZE The heat l heat gained by the wa Use the relationship b ables to find a relation
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Answer #1

Given

Mass = 4.7 g

Temperature

Initial T1 = 25 C = 298 K                  final T2 = 57 C = 330 K

Energy = m Cp (T2- T1) = 57.2 J

4.7 g * Cp * ( 57 - 25 ) C = 57.2 J

Cp = 0.38 J/goC which is not equal to Cp value of Pure gold which is 0.129 J/goC

so the rock is not pure gold

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