A student observes that a 126 mL dry flask with a foil capweighs 50.162g. The st
ID: 631802 • Letter: A
Question
A student observes that a 126 mL dry flask with a foil capweighs 50.162g. The student then adds 5 mL of an unknown volatileliquid and heats the flask in a boiling water bath at 99.2C(degrees) until all liquid disappears. The flask, foil, andunknown after heating that is dry and cool weigh 50.610 g. Thebarometric pressure in the laboratory is 743.3 mm Hg; thelaboratory temperature averages 22.3 C(degrees); the vapor pressureof the unknown liquid is 160 mmHg at 20 C(degrees), and the densityof dry air at STP is 1.2929 g/L. a) What are the experimental conditions of T and P that willbe used to calculated the mass of air in the flask? b) Calculate the density of air at the experimental conditiosnidentified in part a. c) Calculate the mass of air in the flask before the liquidwas added. d) Calculate the partial pressure of air in the flask afterthe liquid was heated and then cooled. e) Calculate the mass of air in the flask after the liquid washeated and then cooled. f) Calculate the mass of air lost. g) Calculate the mass of liquid, vapor and air in the flaskbefore you correct for air lost. h) Calculated the mass of liquid, vapor and air in the flaskafter you correct for air lost. i) Calculated the molecular weight of the unknownliquid. A student observes that a 126 mL dry flask with a foil capweighs 50.162g. The student then adds 5 mL of an unknown volatileliquid and heats the flask in a boiling water bath at 99.2C(degrees) until all liquid disappears. The flask, foil, andunknown after heating that is dry and cool weigh 50.610 g. Thebarometric pressure in the laboratory is 743.3 mm Hg; thelaboratory temperature averages 22.3 C(degrees); the vapor pressureof the unknown liquid is 160 mmHg at 20 C(degrees), and the densityof dry air at STP is 1.2929 g/L. a) What are the experimental conditions of T and P that willbe used to calculated the mass of air in the flask? b) Calculate the density of air at the experimental conditiosnidentified in part a. c) Calculate the mass of air in the flask before the liquidwas added. d) Calculate the partial pressure of air in the flask afterthe liquid was heated and then cooled. e) Calculate the mass of air in the flask after the liquid washeated and then cooled. f) Calculate the mass of air lost. g) Calculate the mass of liquid, vapor and air in the flaskbefore you correct for air lost. h) Calculated the mass of liquid, vapor and air in the flaskafter you correct for air lost. i) Calculated the molecular weight of the unknownliquid.Explanation / Answer
depts.washington.edu/.../Chem142_MolarMass_Prelab_092411.pdf
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