The strongest intermolecular forces between molecules of PH3 are dipole-dipole interactions. hydrogen bonds: ion-dipole attractions London forces QUESTION 10 Which of the following would be expected to have the lowest vapor pressure? Hzo NH3 PH3 AsH3 QUESTION Molarity and molality are different properties: The molarity of solution is defined as the moles of solute per kilogram of solvent: moles of solute per liter of solution_ moles of solute per liter of solvent: grams of solute per liter of solution