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25 November, 08:51

How much energy (in JJ) is lost when a sample of iron with a mass of 29.2 gg cools from 79.0 ∘C∘C to 27.0 ∘C∘C?

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  1. 25 November, 10:52
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    - 0.674 kJ.

    Explanation:

    The equation used to solve this problem is:

    Q = mCΔT

    where,

    Q = amount of heat

    m = mass of the substance

    C = specific heat capacity

    ΔT = change in temperature

    = Temp. f - Temp. i

    Given:

    m = 29.2 g

    Temp. i = 79°C

    Temp. f = 27°C

    Cp (iron) = 0.444 J/g. K

    Q = mCΔT

    ΔT = 27.0°C - 79.0°C

    = - 52°C

    = 29.2 * 0.444 * - 52

    Q = - 674.17 J

    = 0.674 kJ.
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