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Which of the reactions are exothermic? 2Fe2O3(s)+3C(s)4Fe(s)+3CO2(g)CH4(g)+2O2(g)CO2(g)+2H2O(l)NH3(g)+HCl(g)NH4Cl(s)C(graphite)+O2(g)CO2(g)2Mg(s)+O2(g)2MgO(s)AgCl(s)Ag+(aq)+Cl(aq)H=468kJ/molH=891kJ/molH=176kJ/molH=393.5kJ/molH=1203kJ/molH=127kJ/mol When methanol, CH3OH, is burned in the presence of oxygen gas, O2, a large amount of heat energy is released. For this reason, it is often used as a fuel in high performance racing cars. The combustion of methanol has the balanced, thermochemical equation CH3OH(g)+23O2(g)CO2(g)+2H2O(l)H=764kJ How much methanol, in grams, must be burned to produce 889kJ of heat