Given below are the vapor pressures, in atm, at 25 oC for three substances. Norm

Question

Given below are the vapor pressures, in atm, at 25 oC for three substances. Normal boiling points for the three substances are given just below the table. Based upon the vapor pressures, identify the correct normal boiling points of the three substances.

Substance

Vapor Pressure (atm) @ 25 oC

acetone

0.307

diethyl ether

0.668

ethylamine

1.392

Part 1:

Identify the correct normal boiling point of acetone.

A

56.1 oC

B

16.5 oC

C

34.5 oC

Part 2:

Identify the correct normal boiling point of diethyl ether.

A

34.5 oC

B

56.1 oC

C

16.5 oC

Part 3:

Identify the correct normal boiling point of ethylamine.

A

16.5 oC

B

34.5 oC

C

56.1 oC

Substance

Vapor Pressure (atm) @ 25 oC

acetone

0.307

diethyl ether

0.668

ethylamine

1.392

Explanation / Answer

The higher is the vapor pressure of a liquid at a given temperature, the lower the normal boiling point of the liquid.

From this information, it can be said that Acetone has the highest boiling point while Ethylamine has the lowest boiling point.

Part 1. Acetone - 56.1 deg Celsius

Part 2. Diethyl ether - 34.5 deg Celsius

Part 3. Ethylamine - 16.5 deg Celsius

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