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24 August, 13:54

Consider the following reaction. 2Fe2O3 - - > 4Fe + 3O2 deltaH = + 824.2KJ The formation of 42.0 g of O2 results in? 1) the absorption of 361 kJ of heat. 2) the absorption of 11500 kJ of heat. 3) the absorption of 1080 kJ of heat.

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  1. 24 August, 15:59
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    If deltaH is positive, that means the reaction took heat from its environment (endothermic reaction).

    The molar mass of O2 is 32 g/mol.

    Therefore, 42g of O2 is equal to 1.3 moles O2.

    The equation assumes 3 moles of O2. That means, only 1.3/3 = 43% of the delta H in the equation was formed.

    824.2 kJ x 43% = 354 kJ. The closest answer is 1) the absorption of 361 kJ of heat.
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