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I have done an experiment in which I measured the specific heat capacity of a coin. I would like to compare the results to the actual value. I have found out that the coin is made of Cupronickel alloy (for simplicity let's assume it's just 75% copper and 25% nickel).

Knowing the SHC values of the two elements (copper and nickel) how would I go about calculating the theoretical value of the SHC of the Cupronickel alloy, so that I can compare it to my experiment's results?

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I don't think there is a reliable way of calculating the specific heat of a metal alloy as it depends on the details of the interactions between the metals. A quick Google finds a value for the specific heat of CuNi25 of 390J/(kgK).

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