Problem: Consider the following reaction: 2Mg(s) + O2(g) → 2MgO(s)        ΔH = -1204 kJHow many grams of MgO are produced during an enthalpy change of -238 kJ? How many kilojoules of heat are absorbed when 40.5 g of MgO(s) is decomposed into Mg(s) and O2(g) at constant pressure? 

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The given thermochemical equation is:

2 Mg(s) + O2(g) → 2 MgO(s)        ΔH = –1204 kJ


Part A. We are asked to determine the mass in grams of MgO that are produced during an enthalpy change of -238 kJ.

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Problem Details

Consider the following reaction: 2Mg(s) + O2(g) → 2MgO(s)        ΔH = -1204 kJ

How many grams of MgO are produced during an enthalpy change of -238 kJ? 

How many kilojoules of heat are absorbed when 40.5 g of MgO(s) is decomposed into Mg(s) and O2(g) at constant pressure? 

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