The heat of formation of fe2o3(s) is –826.0 kj/mol. calculate the heat of the reaction 4fe(s) + 3o2(g) → 2fe2 o3(s) when a 53.99-g sample of iron is reacted.

Answer : The heat of the reaction is, 399.784 kJ

Explanation :

The given balanced chemical reaction is,

First we have to calculate the moles of iron.

Now we have to calculate the moles of

From the reaction we conclude that,

As, 4 moles of Fe react to give 2 moles of

So, 0.968 moles of Fe react to give moles of

Now we have to calculate the heat of the reaction.

As, 1 mole of produce heat = 826.0 kJ

So, 0.484 mole of produce heat =

Therefore, the heat of the reaction is, 399.784 kJ

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