1. Identify the strongest intermolecular forces (ionic bonds, hydrogen bonds, dipole-dipole, or London dispersion) in each of the following pure substances. a. CaH1n b. KNO3 c. PFF d. NHy 2 Classity each of the following statements as being TRUE or FALSE. a. At a triple point, three phases of a substance exist at the same time. b. On a phase diagram, the line separating the solid and liquid phases has a steeper siope than the line separating the liquid and gas phases. c. Normai melting point is the temperature which solid melts when the pressure is 1 torr d. The viscosity of a liquid decreases as the temperature increasgs. 3. In each of the following pairs of the substances, select the substance which would have the larger (more positive) designated property. a. vapor pressure: C2H3OH or CH3OCH3 b. boiling point: HF or HBr c. surface tension: C3H14 or H2O d. AHtwa: NaBr or Br2 4. Calculate the amount of heat in kJ absorbed when 180.0g of H2Om at 25C is changed to H2O(m) at 125C.Hfos=6.01kJ/mol. Specific heat H2Ocos=4.18j/gC. Specific heat H2O(s)= 2.09 JgC. Specific heat H2O(g=2.01J/gCH=40.7kJ/mol.q=m5t 5At20.0C, the vapor pressure of ethanol is 0.0587atm and at 63.5C its vapor pressure is 0.526atm. Use this informaton to find the enthalpy of vaporization of ethanol in kJ/mol. ln[P2/P1]=(Hvo/R)[1/T11/T2]R=8.314J/molK