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6 January, 17:50

How much energy in joules is released when 18.5 grams of copper cools from 285 °C

down to 45 °C

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Answers (1)
  1. 6 January, 18:18
    0
    Answer: 1709.4 Joules

    Explanation:

    The quantity of Heat Energy (Q) released on cooling a heated substance depends on its Mass (M), specific heat capacity (C) and change in temperature (Φ)

    Thus, Q = MCΦ

    Since Q = ?

    M = 18.5 grams

    Recall that the specific heat capacity of copper C = 0.385 J/g. C

    Φ = 285°C - 45°C = 240°C

    Then, Q = MCΦ

    Q = 18.5grams x 0.385 J/g. C x 240°C

    Q = 1709.4 Joules

    Thus, 1709.4 Joules is released when copper is cooled.
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