CHAP. 7: PHASE EQUILIBRIA [CONTENTS] 187
Obr.7.4:Example of an isobaric-isothermal diagram of a three-component. system.
- The region (α) + (β) + (γ) is also heterogeneous. Here the system is formed by three
phases: pure substance A, pure substance B, and a mixture of the composition given by
point D.
Example
What composition is represented by point S in Figure7.3?
Solution
Point S is the intersection of the line segment on which all mixtures containing 20 % of substance
A can be found with the line segment on which there is 30 % of substance B. This point thus
represents a system composed of 20 % of substance A and 30% of substance B. If we draw a line
in point S parallel to side AB, we can see that the given three-component mixture contains 50 %
of substance C.
