1. Use standard enthalpies of formation to calculate ΔH∘rxn for the following reaction. 2NaHCO3(s)→Na2O(s) + 2CO2(g) + H2O(g)2. Use standard enthalpies of formation to calculate ΔH∘rxn for the reaction. CO(g) + H2O(g)→H2(g) + CO2(g)3. Use standard enthalpies of formation to calculate ΔH∘rxn for the reaction.3NO2(g) + H2O(l)→2HNO3(aq) + NO(g)4. Use standard enthalpies of formation to calculate ΔH∘rxn for the reaction. C6H12O6(s) + 6O2(g)→6CO2(g) + 6H2O(g)