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October 25, 2014

Homework Help: Chemistry..Please Help

Posted by Saira on Sunday, January 18, 2009 at 6:48pm.

1. The vapor pressure of dichloromethane, CH2Cl2, at 0C is 134mmHg. The normal boiling point of dichloromethane is 40C. Calculate its molar heat of vaporization

The answer is in kilojoules per mole.

I know i use the Clausius-Clapeyron equation but i don't know what to plug in.

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2. Classify each property as associated with a liquid that has strong or weak intermolecular forces.

A. LOW BOILING POINT- weak
B. HIGH BOILING POINT- strong
C. LOW VAPOR PRESSURE
D. HIGH VAPOR PRESSURE
E. HIGH SURFACE TENSION
F. LOW SURFACE TENSION
G. HIGH Viscosity
H. LOW Viscosity

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3. The Society of Automotive Engineers has established an accepted numerical scale to measure the viscosity of motor oil. For example, SAE 40 motor oil has a higher viscosity than an SAE 10 oil.

Rank the following hydrocarbons by their expected viscosity.
Rank from most to least viscous.

a. CH3CH2CH2CH2CH2CH3
b. CH3CH2CH2CH2CH2CH2CH2CH3
c. CH3CH2CH2CH2CH2CH2CH2CH2CH2CH3
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