Given....2Mg(s) + O_2(g) rarr 2MgO(s) ; DeltaH_"rxn"=-1203*kJ*mol^-1 What enthalpy is associated with the combustion of FOUR moles of magnesium metal?

1 Answer
anor277
Jun 12, 2017

DeltaH=-2406*kJ...........

Explanation:

2Mg(s) + O_2(g) rarr 2MgO(s) DeltaH_"rxn"=-1203*kJ*mol^-1

Enthalpy terms are written per mole of reaction as written. We combust 4 moles of magnesium metal, and should therefore generate 2xx-1203*kJ=-2406*kJ.

Note that given these data we could write DeltaH_f^@(MgO)=-601.5*kJ. Why?

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