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3 August, 20:53

Calculate the amount of heat (in kJ) released when 18.5 g or calcium hydroxide is formed. The molar mass of calcium hydroxide is 74.09g

CaO (s) + H2O (I) - > Ca (OH) 2 (s) + 65.2 kJ

A. 16.3 kJ

B 260.8 kJ

C 130.4 kJ

D 4.18 kJ

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Answers (1)
  1. 3 August, 21:18
    0
    16.23 kj

    Explanation:

    Given dа ta:

    Mass of calcium hydroxide formed = 18.5 g

    Molar mass of calcium hydroxide = 74.09 g/mol

    Energy released = ?

    Solution:

    Chemical equation:

    CaO + H₂O → Ca (OH) ₂ + 65.2 Kj

    Number of moles of Ca (OH) ₂:

    Number of moles = mass / molar mass

    Number of moles = 18.5 g / 74.09 g/mol

    Number of moles = 0.249 mol

    when one mole of Ca (OH) ₂ formed 65.2 Kj energy is released.

    When 0.249 moles formed energy released is,

    0.249 * 65.2 kj = 16.23 kj
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