when magnesium burns a great deal of heat and light is produced. how many KJ of heat are released when 0.75 moles of magnesium burn in air?

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In order to answer this question you need to know the standard heat of formation of MgO.
The source below says −601.6 kJ/mol.

(0.75 mol) x (601.6 kJ/mol) = 451 kJ...Show more