Chem+102+Quiz+4b+2010-+answers+front

Chem+102+Quiz+4b+2010-+answers+front - ~ 102 g/mol H ! C !...

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Quiz #4 Name b Lab Section: Answer all calculation questions to the correct number of significant figures. Vapor Pressure (mmHg) Molecular Weight (g/mol) 60 80 100 140 16 120 12 8 4 + + + + 1. Prepare a graph for the following vapor pressure data @ 20°C. (4 pts) Molecule 2-butanol 2-hexanol 2-heptanol 2-octanol Vapor Pressure (mmHg) 12.5 2.49 1.23 0.3 2. Using the graph prepared in question 1, predict what the vapor pressure of 2- pentanol (2 pts) 2-Pentanol : ~ 88 g/mol 4.8 mmHg 3. Can you use the graph to predict the vapor pressure of butane? (Hint: consider, what type of intermolecular interactions exist between the molecules you plotted and the types of intermolecular interactions exist between butane) (4 pts) 2-Butanol : ~ 74 g/mol H ! C ! C ! C ! C ! H H I H I OH I H I H I 2-Hexanol :
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Unformatted text preview: ~ 102 g/mol H ! C ! C ! C ! C ! C ! C ! H H I H I OH I H I H I H I 2-Heptanol : ~ 116 g/mol H ! C ! C ! C ! C ! C ! C ! C ! H H I OH I H I H I H I H I H I 2-Octanol : ~ 130 H ! C ! C ! C ! C ! C ! C ! C ! C ! H H I OH I H I H I H I H I H I H I H ! C ! C ! C ! C ! C ! H H I OH I H I H I H I H ! C ! C ! C ! C ! H H I H I H I H I No, this graph is only good for molecules that have one OH group. Butane does not have an OH group. All the bonds in Butane are non-polar, the OH group adds polar bonds, so there are different types of intermolecular forces (dipole-dipole and H-bonds)....
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