The critical temperatures and pressures of a series of halogenated methanes are as follows: (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.

Video transcript

Hey everyone, we're given a table of critical temperatures for various organic compounds. Using this data, they want us to rank by decreasing order of critical pressures. Since they've given us our temperatures, we need to find a relationship between pressure and temperature and we know that pressure is directly proportional to temperature because of our formula PV equals n R. T. As we can see right here, pressure is directly proportional to temperature. And since this is the case, this means our greatest critical pressure will also have the greatest critical temperature. So looking at our chart, our greatest critical pressure will be bromo ethane, followed by chloral ethane and lastly, with our smallest critical pressure flora. So I hope this made sense and let us know if you have any questions.