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21 March, 13:14

Calculate the number of kilojoules to warm 125 g of iron from 23.5 degrees C to 78 degrees C

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  1. 21 March, 13:37
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    The heat capacity of iron is 0.45J/g°C.

    We calculate the heat using the equation:

    ΔH = m cp ΔT

    where

    m is the mass

    ΔH is enthalphy or the heat required

    cp is the heat capacity

    ΔT is the change in temperature

    So,

    ΔH = m cp ΔT = (125g) (0.45 J/g °C) (75°C - 23.5 °C)

    ΔH = 2896.875 J

    Dividing by 1000 to convert to kJ,

    ΔH = 2.897 kJ
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