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.

Question

Chemistry

Ean Simpson

27 July, 05:15

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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Answers (1)

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Scarlet Bullock · Answer 1

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.