The specific heat capacity of a pure substance can be found by dividing the heat

Question

The specific heat capacity of a pure substance can be found by dividing the heat needed to change the temperature of a sample of the substance by the mass of the sample and by the change in temperature. The heat capacity of a certain substance has been measured to be 1.36 1/g degree C. Suppose 291. g of the substance are heated until the temperature of the sample has changed by 8.98 degree C. Write an equation that will let you calculate the heat Q that was needed for this temperature change. Your equation should contain only symbols. Be sure you define each symbol.

Explanation / Answer

According to the principle of thermochemistry, the heat required to change the temperature of a substance is given by

Q = m*C*t

where C = 13.6 J. g-1C-1 is the specific heat capacity of the substance. Some textbooks use the symbol S instead of C to denote the specific heat capacity.

m = 29.1 g is the mass of the substance.

t = 8.98C is the temperature change of the substance (ans).

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