Hess's Law with Enthalpy of Formation A reagent bottle containing concentrated aqueous ammonia, NH3(aq), is accidentally left open near a bottle of concentrated hydrochloric aeid, HCl(aq). The cloud of white smoke that forms in the air near the two containers is ammonium chloride, NH4Cl(s). The following reaction occurs in the air: NH3(g)+HCl(g)NH4Cl(s) Use the standard molar enthalpies of formation to calculate the enthalpy of reaction. Write the thermochemical equation for the reaction. [5 marks]