4Af + 3Ox2 → 2Af2Ox3
How many moles of Ox2 would be needed to make 5.7 moles of Af2Ox3?

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Heat of fusion= heat/mass  heat of fusion = 12.03kj/36 g= 0.3342 kj/g or 334.2 j/g

Remember that rust prevented by placing a sacrificial electrode in electrical contact with the iron. the sacrificial electrode must be composed of a metal that  oxidizes  more easily than iron (that is, it must be below iron in table 18.1).