1. A homeowner fills his pool after cleaning it. The water initially has no oxygen in it. However, oxygen is gained from the atmospheric air by diffusion. What will be the mole fraction of oxygen at a...

1. A homeowner fills his pool after cleaning it. The water initially has no oxygen in it. However, oxygen is gained from the atmospheric air by diffusion. What will be the mole fraction of oxygen at a depth of 1 cm from the surface 10 hours after the pool filling?

2. Moist air has a volumetric analysis of 78% nitrogen, 20% oxygen, and 2% water vapor. (a) What is the analysis on a mass basis? (b) What is the molecular weight of the moist air?