for each of the following situation, explain in what way the experimentally determine molecular weight would...
for each of the following situation, explain in what way the experimentally determine molecular weight would differ from actual molecular weight
a. you neglect to dry the outside of the flask after you have vaporized your unknown liquid.?
b. you assume atmospheric pressure is exactly 1 atmosphere?
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for each of the following situation, explain in what way the
experimentally determine molecular weight would...
i dont understand why the molecular weight i calculated (42.012 g/mol) for my unknown liquid (acetone)...
i dont understand why the molecular weight i calculated
(42.012 g/mol) for my unknown liquid (acetone) is less than the
actual molecular weight (58.08 g/mol). what errors could i have
made in my lab that would account for the difference.
Molecular Weight of a Volatile Liquid In this experiment, an amount of liquid more than sufficient to fill the flask when vaporized is placed in a flask of measured volume and mass. The flask is then heated in a boiling...
Molecular Mass of a Volatile Liquid 1. The atmospheric pressure of a hot summer day in...
Molecular Mass of a Volatile Liquid 1. The atmospheric pressure of a hot summer day in NYC is 29.94 inHg. Calculate this value in mmile and am 2. The atmospheric pressure of a cold winter day in NYC is 25.94 inHg. Calculate this value in Pa. 3. We set up an experiment utilizing the Dumas method to calculate the molar mass of an unknown chemical. A 4.00 mL pure liquid sample of this chemical is vaporized in an Erlenmeyer flask...
Molecular Weight of an Unknown Volatile Liquid
Question Details: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 ina 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 160mmHg at 20 C(degrees), and the densityof...
l. (why?) Finally, r apur By the number of moles of vapor to obtain the molecular mass. molecular massmoles of vapor Determine the average molecular mass of the unknown from your three trials....
l. (why?) Finally, r apur By the number of moles of vapor to obtain the molecular mass. molecular massmoles of vapor Determine the average molecular mass of the unknown from your three trials. (You may use the best two trials if one is very different from the others.) Questions: 1. If the outside of your flask is not dry when the first mass determination is made and it is dried for the second mass determination, what effect will that have...
List t wo reasons why it is necessary to put a pinhole in the aluminum foil...
List t wo reasons why it is necessary to put a pinhole in the aluminum foil 2. Why was it NOT necessary to clean and dry the flask before performing your second determination? 3. A certain liquid has a molecular weight of 100 g/mole. The following data were obtained for a Dumas molecular weight determination: V-0.265 liters T 372 K and P 1.02 atm g of condensed vapor 0.58 g From this data a molecular weight of 65.5 g/mole was...
Explain what effect each of the following mistakes would have on a simple distillation: a) Failure to add a boilin...
Explain what effect each of the following mistakes would have on a simple distillation: a) Failure to add a boiling stone. b) Heating the distillation flask too fast. c) Heating the distillation flask to dryness. d)Using a distillation flask that has a maximum capacity equal to the volume of liquid. e) Using a much larger (e.g., 50 mL) distillation flask. f)Putting the thermometer all the way into the liquid in the distillation flask 1. 2. Using Raoult's Law, calculate the...
For each of the following errors, tell whether your calculated molecular weight would be too high,...
For each of the following errors, tell whether your calculated molecular weight would be too high, too low, or unaffected. a) unawares, you inadvertently spilled some solute(so it didn't make it into the test tube) after it was weighed out. b) your thermometer is poorly calibrated and reads 0.3C lower than the actual temperature. c) while mixing the solution you spilled some over the sides of the test tube. Assume the solution was well mixed before the spill occurred.
please help ? MST SHOW ALL CALCULATIONSs. Please be neat. Use correct significant figures. 1. A...
please help ?
MST SHOW ALL CALCULATIONSs. Please be neat. Use correct significant figures. 1. A student masses an empty flask, aluminum foil (witha small pinhole), and copper wire and finds the mass to be 54.8680 g. She then adds about 5.0 mL of an unknown liquid and heats the flask in a hot waterbath to 95.0 °C. After all the liquid is vaporized, she removes the flask from the bath and masses it after it has cooled. The mass...
DISCUSSION QUESTIONS 1. If the liquid did not completely vaporize in the experiment, would the ap-...
DISCUSSION QUESTIONS 1. If the liquid did not completely vaporize in the experiment, would the ap- parent molecular weight be larger, smaller, or unchanged compared to that determined if the experiment had been properly performed? Would the error in part (1) have a larger, smaller, or the same effect as the errors that might be made in measuring the temperature of the water in the flask, the barometric pressure, or the volume of the flask? Explain your answer. 2. What...
Detail and calculate (explain and show calculations or values used) how you would determine the amount...
Detail and calculate (explain and show calculations or values used) how you would determine the amount of energy it would take to heat 100 lbm, of water at 40F to 230F. Assume that atmospheric pressure is held at 14.696 psi during the entire heating process. Specific heat of liquid water can be assumed to equal 1.0 Btu/(lbm F) while for steam 0.45 Btu/(lbm-F).
i dont understand why the molecular weight i calculated
(42.012 g/mol) for my unknown liquid (acetone) is less than the
actual molecular weight (58.08 g/mol). what errors could i have
made in my lab that would account for the difference.
Molecular Weight of a Volatile Liquid In this experiment, an amount of liquid more than sufficient to fill the flask when vaporized is placed in a flask of measured volume and mass. The flask is then heated in a boiling...
Molecular Mass of a Volatile Liquid 1. The atmospheric pressure of a hot summer day in NYC is 29.94 inHg. Calculate this value in mmile and am 2. The atmospheric pressure of a cold winter day in NYC is 25.94 inHg. Calculate this value in Pa. 3. We set up an experiment utilizing the Dumas method to calculate the molar mass of an unknown chemical. A 4.00 mL pure liquid sample of this chemical is vaporized in an Erlenmeyer flask...
l. (why?) Finally, r apur By the number of moles of vapor to obtain the molecular mass. molecular massmoles of vapor Determine the average molecular mass of the unknown from your three trials. (You may use the best two trials if one is very different from the others.) Questions: 1. If the outside of your flask is not dry when the first mass determination is made and it is dried for the second mass determination, what effect will that have...
List t wo reasons why it is necessary to put a pinhole in the aluminum foil 2. Why was it NOT necessary to clean and dry the flask before performing your second determination? 3. A certain liquid has a molecular weight of 100 g/mole. The following data were obtained for a Dumas molecular weight determination: V-0.265 liters T 372 K and P 1.02 atm g of condensed vapor 0.58 g From this data a molecular weight of 65.5 g/mole was...
Explain what effect each of the following mistakes would have on a simple distillation: a) Failure to add a boiling stone. b) Heating the distillation flask too fast. c) Heating the distillation flask to dryness. d)Using a distillation flask that has a maximum capacity equal to the volume of liquid. e) Using a much larger (e.g., 50 mL) distillation flask. f)Putting the thermometer all the way into the liquid in the distillation flask 1. 2. Using Raoult's Law, calculate the...
please help ?
MST SHOW ALL CALCULATIONSs. Please be neat. Use correct significant figures. 1. A student masses an empty flask, aluminum foil (witha small pinhole), and copper wire and finds the mass to be 54.8680 g. She then adds about 5.0 mL of an unknown liquid and heats the flask in a hot waterbath to 95.0 °C. After all the liquid is vaporized, she removes the flask from the bath and masses it after it has cooled. The mass...
DISCUSSION QUESTIONS 1. If the liquid did not completely vaporize in the experiment, would the ap- parent molecular weight be larger, smaller, or unchanged compared to that determined if the experiment had been properly performed? Would the error in part (1) have a larger, smaller, or the same effect as the errors that might be made in measuring the temperature of the water in the flask, the barometric pressure, or the volume of the flask? Explain your answer. 2. What...
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