The following data present the temperatures at which
Chapter , Problem 11.86(choose chapter or problem)
The following data present the temperatures at which certain vapor pressures are achieved for dichloromethane 1CH2Cl22 and methyl iodide 1CH3I2 Vapor Pressure (torr) 10.0 40.0 100.0 400.0 T for CH2Cl2 1C2 -43.3 -22.3 -6.3 24.1 T for CH3I 1C2 -45.8 -24.2 -7.0 25.3 (a) Which of the two substances is expected to have the greater dipoledipole forces? Which is expected to have the greater dispersion forces? Based on your answers, explain why it is difficult to predict which compound would be more volatile. (b) Which compound would you expect to have the higher boiling point? Check your answer in a reference book such as the CRC Handbook of Chemistry and Physics. (c) The order of volatility of these two substances changes as the temperature is increased. What quantity must be different for the two substances for this phenomenon to occur? (d) Substantiate your answer for part (c) by drawing an appropriate graph.
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