Phase Changes (Section)The critical temperatures (K) and

Chapter 11, Problem 48E

(choose chapter or problem)

Problem 48E

Phase Changes (Section)

The critical temperatures (K) and pressures (atm) of a series of halogenated methanes are as follows:

Compound	CCl3F	CCl2F2	CClF3	CF4
Critical temperature	471	385	302	227
Critical pressure	43.5	40.6	38.2	37.0

(a) List the intermolecular forces that occur for each compound.

(b) Predict the order of increasing intermolecular attraction, from least to most, for this series of compounds,

(c) Predict the critical temperature and pressure for CCl4 based on the trends in this table. Look up the experimentally determined critical temperatures and pressures for CCl4, using a source such as the CRC Handbook of Chemistry and Physics, and suggest a reason for any discrepancies.