Gen Chem II Assignment 3

Vapor Pressure and Phase Changes
Part A
Substance A 275mmHg- Higher boiling point and higher heat of vaporization
Substance B 459mmHg- weaker intermolecular forces and is a gas at 300mmHg
Part B
The vapor pressure of dichloromethane at 0 degrees C is 134 mmHg. The normal boiling point of dichloromethane is 40.degrees C. Calculate its molar heat of vaporization.

30.9kJ/mol

Problem 10.58
Carbon disulfide has P(vap) = 100mmHg at -5.1 degrees C and a normal boiling point of 46.5 degrees C.

28.0kJ/mol

Problem 10.59
The vapor pressure of silicon tetrachloride is 100mmHg at 5.4 degrees C, and the normal boiling point is 56.8 degrees C.

30.2 kJ/mol

Problem 10.60
What is the vapor pressure of carbon disulfide (in mmHg) at 29.5 degrees C? Carbon disulfide has P(vap) = 100mmHg at -5.1 degrees C and the heat of vaporization = 28.0 kJ/mol.
=422mmHg

Problem 10.61
What is the vapor pressure of SiCL_4 (in mmHg) at 34.0 degrees C? The vapor pressure of is 100mmHg at 5.4 degrees C, and heat of vaporization = 30.2kJ/mol.
P =337 mmHg

Problem 10.66
=30.1kJ/mol

Problem 10.67
=59.8 kJ/mol

These answers were very helpful for me since I am in chemistry. I don't know about the students that are not…haha! :D

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