# chemistry 101

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given the reaction: 2mg + o2-----> 2mgo . when 4.32g of oxygen react with magnesium 327kj of energy is produced. the heat of reaction for 1 mole of oxygen is???

• chemistry 101 -

how many moles is 4.32 of MgO?

take that number, call it NUMBER.

heat of energy = 327kjoules/NUMBER

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