The mineral magnetite (Fe 3 O 4 ) is magnetic, whereas iron(II) oxide is not. (a

Question

The mineral magnetite (Fe3O4) is magnetic, whereas iron(II) oxide is not.

(a) Write and balance the chemical equation for the formation of magnetite from iron(II) oxide and oxygen.

Use the smallest whole number coefficients. Include phases in the equation. Type an open parenthesis "(" to add a phase. Phases should not be subscripted.

(b) Given that 318 kJ of heat are released for each mole of Fe3O4 formed, what is the enthalpy change of the balanced reaction of formation of Fe3O4 from iron(II) oxide and oxygen?

___________kJ

Explanation / Answer

a) FeO + O2    ------- >       Fe3O4

Balanced equation   6FeO(s) + O2 (g ) ----> 2Fe3O4 (s)

b) For each mole Fe3 O4 formed entalpy change = -318 KJ

For Balanced equation which has 2 moles Fe2O3

ENTHALPY CHANGE for balanced equation = 2* (-318) = -636 KJ

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