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laboratory questions experiment 12
L Moles of vapor·n,..mo) 2. Mass of vapor,m(g) 3. Molar mass of compound (/mol Average molar mass (gfmot) Calculation of from van der Waals' equation for Trial 1. Show work here. a:100(12.) b:10o Laboratory Questions Circle the questions that have been assigned. 1. Part A.1. The mass of the flask (before the sample in placed into 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 b. Will the molar mass of vapor in the flask be reported as too high or too low, or will it be unaffected? Explain. flask (before the sample in placed into the flask) is measured when the outside of the flask is be reported as too high or too low, or will it be unaffected? Explain. 2. Part A.1. 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. 3. Part A.2. 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. 4. Part B.2. The flask is completely filled with vapor only when it is removed from the hot water bath in Part B3. 5. Part B.2. Suppose the thermometer is miscalibrated to read 0.3°C higher than actual. Does this error in calibration 6. Part C.1. If the volume of the flask is assumed to be 125ml. instead of the measured volume, would the calculated 7. Part C.2. The pressure reading from the barometer is recorded higher than it actually is. How does this affect the 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. result in the molar mass of the vapor in the flask being reported as too high, too low, or as unaffected? Explain molar mass of the unknown liquid be too high, too low, or unaffected by this experimental error? Explain. reported molar mass of the liquid: too high, too low, or unaffected? Explairn. 180 Molar Mass of a Volatile Liquid 154
laboratory questions experiment 12
L Moles of vapor·n,..mo) 2. Mass of vapor,m(g) 3. Molar mass of compound (/mol Average molar mass (gfmot) Calculation of from van der Waals' equation for Trial 1. Show work here. a:100(12.) b:10o Laboratory Questions Circle the questions that have been assigned. 1. Part A.1. The mass of the flask (before the sample in placed into 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 b. Will the molar mass of vapor in the flask be reported as too high or too low, or will it be unaffected? Explain. flask (before the sample in placed into the flask) is measured when the outside of the flask is be reported as too high or too low, or will it be unaffected? Explain. 2. Part A.1. 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. 3. Part A.2. 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. 4. Part B.2. The flask is completely filled with vapor only when it is removed from the hot water bath in Part B3. 5. Part B.2. Suppose the thermometer is miscalibrated to read 0.3°C higher than actual. Does this error in calibration 6. Part C.1. If the volume of the flask is assumed to be 125ml. instead of the measured volume, would the calculated 7. Part C.2. The pressure reading from the barometer is recorded higher than it actually is. How does this affect the 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. result in the molar mass of the vapor in the flask being reported as too high, too low, or as unaffected? Explain molar mass of the unknown liquid be too high, too low, or unaffected by this experimental error? Explain. reported molar mass of the liquid: too high, too low, or unaffected? Explairn. 180 Molar Mass of a Volatile Liquid 154
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