The lattice energy* of NaI is _686 kJ/mol, and the enthalpy of hydration is _694 kJ/mol. Calculate the enthalpy of solution per mole of solid NaI. Describe the process to which this enthalpy change applies.
Chapter2 Thursday,August31,2017 5:56PM AtomsandElements • Matterisneithercreatednordestroyed • Inchemicalreactions,whatyoustartwithinmass,youendupwith ReactantsProducts LawofDefiniteProportions • Allsamplesofagivencompound,regardlessofthesourceorhowtheywere prepared,willhavethesameproportionsoftheirconstituentelements • Acompoundisdecomposedtoitsconstituentelementsandproduced25.6gofO and9.60gofC.Asecondsampleofthesamecompoundproduced21.6gO.How muchcarbonisinthesecondsample (25.6gO/9.60gC)=(21.6gO/xgC)CrossMultiply… (207.36/25.6)=8.1(25.6gx/25.6)x=8.10gC LawofMultipleProportions • Musthave