Amixture of dry air and nh3 enters an absorption tower at 80 of and 740 mm hg with 95 % saturation. water was used to absorbed part of the nh3. the gas leaves the tower at 730 mm hg and 60 oe and contains 0.2 % mol nh3 and is saturated with water vapor the nh3 in feed is absorbed. calculate what % of vapor pressure of ammonia at 80 of is 50 mm hg