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14 April, 02:38

A container filled with 2.46 kg of water underwent a temperature change from 25.24 °C to 27.31 °C. How much heat, measured in kilojoules, did the water absorb?

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  1. 14 April, 05:26
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    The correct answer is 21.3 J

    Explanation:

    The heat absorbed by water can be calculated by using the following equation:

    heat = m x Sh x ΔT

    Where m is the mass of water (2.46 kg = 2460 g), Sh is the specific heat capacity of water (4.18 J/g.ºC) and ΔT is the difference of temperatures (final T - initial T). We introduce this values and calculate the heat:

    heat=2460 g x 4.18 J/g.ºC x (27.31ºC - 25.24ºC)

    heat = 21,285.39 J

    As 1 KJ = 1000 J, we must divide the answer into 1000 to obtain the heat in KJ:

    21,285.39 J x 1 KJ/1000 J = 21.28 KJ≅ 21.3 KJ
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