Solubility (College Board AP Chemistry)

Answer the following questions about the compounds NH₂Cl and NCl₃. The Lewis electron-dot diagrams of the two compounds are shown.

Calculate the number of moles of NH₂Cl (molar mass 51.48 g/mol) present in 1.0 L of a solution in which the concentration of NH₂Cl is 0.0016 g/L.

NH₂Cl is highly soluble in water, whereas NCl₃ is nearly insoluble. Explain this observation in terms of the types and relative strengths of the intermolecular forces between each of the solutes and water.

The value of ∆H°_vaporization  for NCl₃(l) is 32.9 kJ/mol . Calculate the amount of energy required to vaporize a 15.0 g sample of NCl₃(molar mass 120.36 g/mol).