Chapter 22, Problem 84A

Interpretation Introduction

Interpretation : The boiling point of dodecane is to be predicted. The actual boiling point of dodecane is to be found. The actual boiling point with prediction is to be compared.

Concept Introduction : The temperature at which a liquid's vapor pressure equals the surrounding atmosphere is known as the boiling point of the liquid. This temperature causes the liquid to become a vapor.

Answer to Problem 84A

The predicted boiling point of dodecane is ${225}^{\circ }\text{C}$ .

The actual boiling point of dodecane is ${216.2}^{\circ }\text{C}$ .

The actual boiling point of dodecane differs from the predicted boiling point.

Explanation of Solution

The graph plotted between the number of carbons and temperature is as follows:

  

Dodecane is a straight-chain alkane containing twelve carbons.

But in the graph, there is plotting only 10 carbons.

To find the boiling point of dodecane from the graph, the graph has to be extrapolated.

According to the graph, the boiling point of dodecane is ${225}^{\circ }\text{C}$ .

But the actual boiling point of dodecane is ${216.2}^{\circ }\text{C}$ .

The actual boiling point differs from the predicted boiling point.

This is because the graph plotted is curved.

Since the predicted boiling point is an imaginary value.