The student then adds 5 mL of an unknown volatile liquid and heats the flask in a boiling water bath at 99.2C(degrees) until all liquid disappears. A student observes that a 126 mL dry flask with a foil cap weighs 50.162g. The flask, foil, and unknown after heating that is dry and cool weigh 50.610 g. The barometric pressure in the laboratory is 743.3 mm Hg; the laboratory temperature averages 22.3 C (degrees); the vapor pressure of the unknown liquid is 160 mmHg at 20 C(degrees), and the density of dry air at STP is 1.2929 g/L.
1. Explain the experimental conditions of P and T that will be used to measured the mass of air in the flask?
2. Determine the density of air at the experimental conditions identified in part a.
3. Determine the mass of air in the flask before the liquid was added.
4. Determiner the partial pressure of air in the flask after the liquid was heated and then cooled.
5. Determine the mass of air in the flask after the liquid was heated and then cooled.
6. Determine the mass of air lost.
7. Determine the mass of liquid, vapor and air in the flask before you correct for air lost.
8. Determined the mass of liquid, vapor and air in the flask after you correct for air lost.
9. Determined the molecular weight of the unknown liquid.