Consider the following reaction. Another Chemistry problem. Please help :(?

Consider the following reaction: 2Fe2O3= 4Fe+3O2 Change of heat= +824.2KJ

The formation of 52.0 g of Fe results in

A) the absorption of 10700 kJ of heat.

B) the release of 192 kJ of heat.

C) the absorption of 192 kJ of heat.

D) the absorption of 767 kJ of heat.

E) the release of 767 kJ of heat.

F) the release of 10700 kJ of heat.

Please help Thank you in advance 🙂 🙂

3 Answers

  • C.

    A positive change of heat means it’s endothermic, so it absorbs heat.

    The change in heat given is PER MOLE:


    You have 4 moles of Fe, so:

    824.2kJ/4 mol = 206.05 kJ/mol

    You’re given 52.0 g Fe. Convert this to moles:

    52.0g * 1mol/55.8g = .932 mol Fe

    So now you know you have .932 mol Fe to start with. Since the change in heat of Fe is 206.05 kJ/mol, then:

    4 mol * 206.05 kJ/mol = 192 kJ

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  • C

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