# Chem

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1. 2Mg + O2 ==> 2MgO + 1203 kJ (although I can't tell if you meant that to be a + or a -).
You know from the equation that 2 mol Mg (which is 2*24.3 g Mg) liberates 1203 kJ/
So 1203 kJ x 7.01/(2*24.3) = ? and you place the right sign on it.

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