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23 April, 13:28

How many joules of energy are needed to change the temperature of 75.0 g of water 250C?

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  1. 23 April, 14:14
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    17000 joules

    Explanation:

    With knowledge of the specific heat capacity of a substance, its mass, and the temperature change, we can convert this to the energy required for this temperature change using:

    ΔH=mCΔT, where

    ΔH = change in enthalpy (J)

    m = mass of substance being heated (g) i. e. water in this question

    C = specific heat capacity (J/g°C)

    ΔT = change in temperature (°C)

    We know mass = 65g and ΔT=76°C-12°C=64°C

    The specific heat capacity of water is 4.18J/g°C

    Therefore, ΔH=65g⋅ 4.18J g°C ⋅64 °C

    =17388.8J

    =17000J (2 significant figures)
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