is the enthalpy change for the formation of Fe(III) oxide negative or positive? (No calculations required)?

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is the enthalpy change for the formation of Fe(III) oxide negative or positive? (No calculations required)?

4 Fe(s)+3 O2(g)---> 2 Fe2O3

2007-04-08 03:35:31 · 2 answers · asked by 8 3 in Science & Mathematics ➔ Chemistry

2 answers

This reaction is exothermic, the same as burning gas in oxygen. The difference is that rusting occurs over a long period of time, so you do not perceive the heat generated.

Therefore the enthalpy of reaction is negative

2007-04-08 03:43:09 · answer #1 · answered by reb1240 7 · 0⤊ 0⤋

The vast majority of oxides all have a negative enthalpy of formation - including this one.

2007-04-08 03:38:51 · answer #2 · answered by Gervald F 7 · 0⤊ 0⤋