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13 February, 00:27

An iron bar of mass 869 g cools from 94 C to 5 C. Calculate the heat releases in (Kilojoules) by the metal.

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  1. 13 February, 00:56
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    For this question, we apply the equation:

    Q = mCp ΔT

    Where m is the mass of the substance, Cp is its specific heat capacity and ΔT is the temperature change.

    Q = 896 x 0.45 x (5 - 94)

    Q = - 35884.8 Joules

    So about - 36 kilojoules of heat is released.
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