You Are Given Pure Samples of Ethane, C₂H₆(g), and Toluene $\degree$

question 7

Multiple Choice

You are given pure samples of ethane, C₂H₆(g) , and toluene, C₇H₈(l) . What prediction would you make concerning their standard molar entropies at 298 K?

• A) S\(\degree\)_ethane > S\(\degree\)_toluene
• B) S\(\degree\)_ethane < S\(\degree\)_toluene
• C) S\(\degree\)_ethane \(\approx\) (S\(\degree\)_toluene) / 3
• D) S\(\degree\)_ethane \(\approx\)S\(\degree\)_toluene
• E) Since toluene is much more complex than ethane, but ethane is in the gas phase while toluene is a liquid, none of these predictions can be confidently made without further information or calculations.

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Definitions:

Carbocation

A species characterized by a carbon atom bearing a positive charge and three bonds instead of the usual four, making it highly reactive in organic reactions.

4-Phenylbutan-2-ol

An organic compound with the structure of butan-2-ol substituted with a phenyl group at the fourth carbon.

3-Phenylpropanal

An organic compound characterized by a benzene ring attached to a three-carbon chain ending in an aldehyde group.

3-Methylhept-4-yn-3-ol

An organic molecule characterized by a chain of eight carbon atoms with a triple bond and a methyl and alcohol functional group attached.