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Part III. Use of Hesss Law to Determine the Heat of Formation of Magnesium Oxide Write in the average molar heats of reactio
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DHO = -492.5 - mg + and yº 7 210 - mach + H₂ mydy + H20 DHS - 130.5 - ③ in rerous mgah + o mgo + 2HU Anet 130.5 - 3 H₂ + 120

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