Thecornersofthegraphrepresentthebeginning orendof aphasechangeforexamplethe corneron theveryleftrepresentstheend thesolidphaseandthe beginningofthemixedphaseat thatcornerthesolidis all that ispresentbuttheliquidisbeginningtoformb thewaterisin themixedphasewith ice atbthewateris roomtemperatureandatpointl the water isat theveryend ofthemixedphasewithsteam thewateris atroomtemperatureintheliquidphase the water candis atthebeginningof themixedphaseofsolid andliquid iii the water cin the middleofthemixedphaseofliquidandgas togofrom about kjwouldhaveto beremovedbecausepointc isat andpointbisatabout kjtheinitialconditionisthe startofthegasphaseand thefinalconditionis themiddleofthe liquidphase togofromato about needto beaddedto the systembecausepointa about usandpoint pointa themixedphaseofsolidand liquidpoint isat theverybeginningofthegasphase ainitial finalcopper oetn tisooo ttsooooaaenergyaddedksq ibfinalice ownin iinitialoeth bondenergies