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The thermochemical equation below shows the decomposition of the mineral magnesite: MgCO3(s) => MgO(s) + CO2(g) ΔHrxn = 117.3 kJ What is ΔH when 5.35 mol of CO2 reacts with excess MgO? A. 314 kJ B. -628 kJ C. 628 kJ D. -314 kJ E. none of these is within 5% of the correct value