`(A) to (Q)`, Here.s law states that enthalpy change in a reaction remains the same whether the reaction takes placce in one step or in several steps. `(B) to (R )`, Combustion reactions are exothermic. `( C) to (Q) , (DeltaH_("vap"))/("Boiling point in K") = 88 JK^(-1)"mol"^(-1)` `(D) to (P), 2.303 log P_(2)/P_(1) =(DeltaH_("vap"))/R (T_(2)-T_(1))/(T_(1)T_(2))` In a Clausius -Clapeyron equation.
