a. Write out in your own words what the van der Waals a and b parameters...

a. Write out in your own words what the van der Waals a and b parameters represent.
b. Rank in increasing order the van der Waals a and b parameters for the following four gases: Hydrogen, Benzene, Ethanol, and Ethane. Check your intuition by looking up these values and explaining the observed trends in a and b.

Solutions

Expert Solution

1. The value of a is direct measure of magnitude of attractive forces between the molecules

A gas with higher a value gas can be easily liquified

2. Greater the value of b gives an idea about the effective size of gas molecules

Greater the value of b larger is the size of molecule and smaller is compressable volume

For most of the easily liquifible gases the value of a/b is high

Gases	a value	b value
Hydrogen	0.2476	0.02661
benzene	18.24	0.1154
ethanol	12.18	0.08407
ethane	5.562	0.0638

a values Hydrogen<ethane<ethanol<benzene

b values Hydrogen<ethane<ethanol<benzene

queen_honey_blossom answered 1 year ago

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