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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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dsdrajlin

Answer:

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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