The AHsor for NaF is 82 kJ/mol, and the lattice energy is -923 kJ/mol. If the hydration enthalpy of sodium is 21 kJ/mol more than the hydration enthalpy of fluoride, what are the hydration enthalpies for the sodium and fluoride ions? Use A
Hsol= - Hiat + Hydr
sodium: -841 kJ/mol; fluoride: -862 kJ/mol
O sodium: -431 kJ/mol; fluoride: -410 kJ/mol
O sodium: -410 kJ/mol; fluoride: -431 kJ/mol
Osodium: -389 kJ/mol; fluoride: -410 kJ/mol

Two changes are described below. a green banana turns yellow and ripens. a layer of rust forms on an iron nail. which statement is true about the two changes? a) both are chemical changes because new substances are formed. b) both are physical changes because only the physical state of the substances change. c) a is a physical change due to a change of state, but b is a chemical change because new molecules are formed. d) a is a chemical change due to a change of state, but b is a physical change because new molecules are formed.