3. Based on the strength of intermolecular forces present, arrange the following substances in order of increasing (lowest first) boiling point. Explain how you arrived to that order. a. H₂S, H₂O, H₂Se b. CH3F, CH3CH3, CH3OH C. CH4, CH3CI, CF4

For each of the following pairs, choose the member with the lower boiling point. Explain your reason in each case. (a) NaCl or PCl3 (b) NH3 or AsH3 (c) C3H7OH or C2H5OCH3 (d) HI(g) or HCl(g)

Use Figure 11.7 to estimate the boiling point of carbon tetrachloride, CCl4, under an external pressure of 250 mmHg.

Consider the iodine monochloride molecule, ICI. Because chlorine is more electronegative than iodine, this molecule is a dipole. How would you expect iodine monochloride molecules in the gaseous state to orient themselves with respect to each other as the sample is cooled and the molecules begin to aggregate? Sketch the orientation you would expect.