A student observer that a 126 mL dry flash with a foil cap weighs 50.162g. The student then adds 5mL of an unknown volatile liquid and heats the flash in a boiling water bath at 99.2C until all liquid dissappears. The flask, foil, and unknown after heating that is dry and cool weigh 50.610g. The barometric pressure in the laboratory is 743.3mm Hg; the laboratory temperature averages 22.3C; the vapor pressure of the unknown liquid is 160mmHg at 20C and the density of dry air at STP is 1.2929g/L.
A) What are he experimental conditions of T and P that will be used to calculate the mass of air in the flask?
B) Calculate the density of air at the experimental conditons identified in part A
C) Calculate the mass of air in the flask before the liquid was added.
D) Calculate the partial pressure of air in the flask after the liquid was heated and then cooled.
E) Calculate the mass of air in the flask after the liuid was heated and then cooled.
F) Calculate the mass of air lost
G) Calculate the mass of liquid, vapor and air in the flask before you correct for air lost
H) Calculate the mass of liquid, vapor and air in the flask after you correct for air lost.
I) Calculate the molecular weight of the unknown liquid.