1) List the types of intermolecular forces that exist between molecules (or basi

Question

1) List the types of intermolecular forces that exist between molecules (or basic units) in cach of the following species: a) Sodium chloride (NaCI) b) Chloroform (CHiCI) c) Methane (CHa) 2) Arrange the following substances in order of increasing boiling point: CHIOH, He, CHjCI, and NaCl Explain your reasoning 3) The phase diagram of sulfur is shown below. Monoclinic and rhombic are two allotropes of sulfur. 154°C 1288 atm Liquid Rhombic Monoclinic 1.0 104 atm Vapor 10-5 atm 119 C) 95.4 Using the given phase diagram of sulfur, answer the following questions a) How many triple points are in the diagram? b) Is any critical point shown in the diagram? c) Under atmospheric conditions, which allotrope, the monoclinic or the rhombic, is more stable? 4) The distance between layers in a sodium chloride (NaCI) crystal is 282 pm. X ray are diffracted from these layers at an angle of 30.0°. Assuming that n-1, calculate the wavelength of the X rays in nm (nanomcters). 5) Palladium metal has a density of 12.02 g'em and unit cell edge length of 388.9 pm. The Palladium atoms occupy only the lattice points, (a) In what cubic unit cell, does palladium crystallize? (b) What is the atomic radius of palladium? (Show your calculations step by step) 6) The vapor pressure of propanc, CHs, is 40.1 mmlig at 7.6 "C. What is its pressure at 60.6 °C? The molar heat of vaporization of propane is 15.7 k/mol.

Explanation / Answer

Ans 1

Part a

NaCl is polar molecule

Intermolecular forces in NaCl = ionic dipole forces

Part b

CHCl3 is polar molecule

Intermolecular forces in CHCl3 = dipole-dipole

Part C

CH4 is non polar

Intermolecular forces in CH4 = London dispersion forces

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