1. * Henry’s Law
air(1)/water(2) VLE
x21 : y2 P = x2 P2sat  y2 = P2sat / P (approximation)
x10 ; x1 = ?
yi P = xi Hi : Henry’s Law
Ex 10-2) CO2 (1) / water (2) system at 10 oC
H1 = 990 bar at 10 oC, x1 = ?, y2 = ?
y1 P = x1 H1 , y2 P = x2 P2sat
P = x1 H1 + x2 P2sat
P2sat = bar  steam table, Assume x1 = 0.01  P = bar
x1 = P / H1 y1 = P / H1 = 0.01 : Assumption is correct.
y1 1
y2 = x2 P2sat / P =
y1 =  1

3. a) x1 = 0.25 , T = K → P, yk
P1sat = kPa, P2sat = kPa
b) y1 = 0.60 , T = K → P, xk

4. (c) P = kPa , x1 = → T, yk
T1sat = , T2sat = K at kPa

5. P = kPa , y1 = → T , xk

6. e) Taz = K → Pa z , x1a z = y1a z