A concentrated binary solution containing mostly species is in equilibrium with a vapor phase containing both species 1 and 2. The pressure of this two-phase system is 1 bar; the temperature is 298.0K. Determine from the following data good estimates of x1 and y1. H1 = 200 bar; = 0.10 bar.
= 200 bar, = 0.1 bar, = 1 bar
Assume that vapor phase is ideal at = 1 bar. Assume Lewis - Randall rule applies to concentrated species and Henry’s law to dilute species then: And
Now
Or Solving gives, and
is in equilibrium with a vapor phase containing both species 1 and 2. The pressure of this two-phase system is 1 bar; the temperature is 298.0K. Determine from the following data good estimates of x1 and y1. H1 = 200 bar; 
= 0.10 bar.
= 0.1 bar, 
= 1 bar
= 1 bar. Assume Lewis - Randall rule applies to concentrated species and Henry’s law to dilute species then:
And 
Solving gives, 
and 
