4. Problem 4.58 from the book

4.58. Absorption of ammonia from nitrogen into water.

A vapor mixture of equal volumes NH, and N, is contacted at

20°C and 1 atm (760 torr) with water to absorb some of the NH,.

Partial Pressure of

NH, in Air, torr

470

298

227

114

69.6

50.0

31.7

24.9

18.2

15.0

12.0

Grams of Dissolved

NH,/100 g of H₂O

40

30

25

20

15

10

7.5

5.0

4.0

3.0

2.5

2.0

If 14 m³ of this mixture is contacted with 10 m³ of water, calculate

the % of ammonia in the gas that is absorbed. Both T and P are main-

tained constant. The partial pressure of NH, over water at 20°C is

given in the table above.