A student weighs an empty flask, aluminum foil, and copper wire and finds the mass to be 54.8680g. She then adds about 5.0mL of an unknown liquid and heats the flask in a boiling water bath to 99.0°C. After all the liquid is vaporized, she removes the flask from the bath and weighs it after it has cooled. The weight of the flask, foil, wire, and unknown liquid was found to be 55.8020g. The volume of the flask is 242.5mL and barometric pressure was 747.0mm Hg (Torr).
What was the pressure of the vapor in the flask in atm?
I have 0.9829 atm
What was the temperature of the vapor in K? the volume of the flask in liters?
I have 372.15K and 0.2425L
What was the mass of the vapor that was present in the flask?
I have 0.9340g
What is the mass of one mole of vapor?
I have 119.2g/mol
Also if all of the unknown liquid has not fully vaporized, would the result for the molar mass be higher, lower, or the same as a properly done experiment?
I said it would be the same.
2007-10-31 04:58:55 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
It means do your homework on your own or ask your parents, dummy.
2007-10-31 05:02:36 · answer #1 · answered by ? 5 · 0⤊ 1⤋
Everything is good except the last question. If all of the liquid did not vaporize, then the final weight, and therefore the density, of the vapor would seem higher than it should be. Then the molecular weight would seem higher.
2007-10-31 05:10:45 · answer #2 · answered by steve_geo1 7 · 0⤊ 0⤋
I have checked your chem answers, they are definitly chem related. boiling is 100 C, so your math is above sea level. adjust accordingly
2007-10-31 05:49:07 · answer #3 · answered by Anonymous · 0⤊ 0⤋