A) calculate δh o fus and δs o fus for sodium metal and determine the melting temperature of sodium. δh o fus kj/mol δs o fus j/k · mol tmelt °c
(b) calculate δh o vap and δs o vap for sodium metal and determine the boiling temperature of sodium. δh o vap kj/mol δs o vap j/k · mol tboil °c

There are two molecules. check the attached file for the solution.

Answer is:     molar solubility of  yttrium fluorid is 4.23·10⁻⁶ m. balanced chemical reaction: yf₃(s)  → y³⁺(aq) + 3f⁻(aq). ksp = 8.62·10⁻²¹. ksp = [y³⁺]  · [f⁻]³.[y³⁺] = [yf₃] = s.[f⁻] = 3[yf₃] = 3s.ksp(yf₃)  = s  · (3s)³.8.62·10⁻²¹ = 27s⁴.s(yf₃)  =  ⁴√(8.62·10⁻²¹  ÷ 27).s(yf₃)  = 0.00000423 m.s(yf₃) = 4.23·10⁻⁶ m.