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8 May, 19:06

A chemist measures the energy change? H during the following reaction:

2H2O (l) ?2H2 (g) + O2 (g)

=? H572. kJ

Is the reaction endothermic or exothermic?

Does it absorb or release heat when 75.8 of H2O react?

Using the numbers above how many kJ of heat will be released or absorbed?

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  1. 8 May, 22:10
    0
    Endothermic

    It absorbs heat

    1.20 * 10³ kJ

    Explanation:

    Let's consider the following thermochemical equation.

    2 H₂O (l) → 2 H₂ (g) + O₂ (g) ΔH = 572 kJ

    Since ΔH > 0, the reaction is endothermic, that is, it absorbs heat when H₂O reacts.

    572 kJ are absorbed when 36.03 g of water react. The heat absorbed when 75.8 g of H₂O react is:

    75.8 g H₂O * (572 kJ/36.03 g H₂O) = 1.20 * 10³ kJ
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