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16 Nov 2019
question 1-6
Circle the questions that have been assigned. The mass of the flask (before the sample in placed into the flask) is measured when the outside of the flask is wet. However, in Part B.3, the outside of the flask is dried before its mass is measured. a. Will the mass of vapor in the flask be reported as too high or too low, or will it be unaffected? Explain. b. Will the molar mass of vapor in the flask be reported as too high or too low, or will it be unaffected? Explain. From the time the mass of the flask is first measured in Part A. 1 until the time it is finally measured in Part B.3, it is handled a number of times with oily fingers. Does this lack of proper technique result in the molar mass of the vapor in the flask being reported as too high or too low or as unaffected? Explain. The aluminum foil is pierced several times with large pencil-size holes instead of pin-size. a. How will this oversight in the procedure affect the mass of vapor measured in Part B.3, too low, too high, or unaffected? Explain. b. Will the reported molar mass of the liquid be reported too low, too high, or unaffected? Explain. The flask is completely filed with vapor only when it is removed from the hot water bath in Part B.3. However, when the flask cools, some of the vapor condenses in the flask. As a result of this observation, will, the reported molar mass of the liquid be too high, too low, or unaffected? Explain. Suppose the thermometer is miscalibrated to read 0.3 degree C higher than actual. Does this error in calibration result in the molar mass of the vapor in the flask being reported as too high, too low, or as unaffected? Explain. If the volume of the flask is assumed to be 125 mL instead of the measured volume, would be calculated molar mass of the unknown liquid be too high, too low, or unaffected by this experimental error? Explain. The pressure reading from the barometer is recorded higher than it actually is. How does this affect the reported molar mass of the liquid: too high, too low, or unaffected? Explain.
question 1-6
Circle the questions that have been assigned. The mass of the flask (before the sample in placed into the flask) is measured when the outside of the flask is wet. However, in Part B.3, the outside of the flask is dried before its mass is measured. a. Will the mass of vapor in the flask be reported as too high or too low, or will it be unaffected? Explain. b. Will the molar mass of vapor in the flask be reported as too high or too low, or will it be unaffected? Explain. From the time the mass of the flask is first measured in Part A. 1 until the time it is finally measured in Part B.3, it is handled a number of times with oily fingers. Does this lack of proper technique result in the molar mass of the vapor in the flask being reported as too high or too low or as unaffected? Explain. The aluminum foil is pierced several times with large pencil-size holes instead of pin-size. a. How will this oversight in the procedure affect the mass of vapor measured in Part B.3, too low, too high, or unaffected? Explain. b. Will the reported molar mass of the liquid be reported too low, too high, or unaffected? Explain. The flask is completely filed with vapor only when it is removed from the hot water bath in Part B.3. However, when the flask cools, some of the vapor condenses in the flask. As a result of this observation, will, the reported molar mass of the liquid be too high, too low, or unaffected? Explain. Suppose the thermometer is miscalibrated to read 0.3 degree C higher than actual. Does this error in calibration result in the molar mass of the vapor in the flask being reported as too high, too low, or as unaffected? Explain. If the volume of the flask is assumed to be 125 mL instead of the measured volume, would be calculated molar mass of the unknown liquid be too high, too low, or unaffected by this experimental error? Explain. The pressure reading from the barometer is recorded higher than it actually is. How does this affect the reported molar mass of the liquid: too high, too low, or unaffected? Explain.
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