2A. Thermochemical Equations A thermochemical equation is a balanced chemical equation that includes the physical states of all reactants and products, and energy changeIn a thermochemical equation, the enthalpy of change for the reaction can be written as either a reactant or a product
4B. Thermochemical Equation Practice Write the thermochemical equation for the addition of oxygen gas to solid iron (III) if the ΔHrxn= kJFe(s) O2(g)→ Fe2O3(s) kJWrite the thermochemical equation for the decomposition of sulfur trioxide gas into sulfur dioxide gas and oxygen gas if the ΔHrxn= 198 kJSO3(g) kJ → SO2 (g) + O2 (g)Exothermic432Endothermic22
6A. Hess’s LawHess’s law states that if you can add two or more thermochemical equations to produce a final equation for a reaction, then the sum of the enthalpy changes for the individual reactions is the enthalpy change for the final reaction2S(s) + 3O2(g) 2SO3(g) H = ?