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vapor density lab - also we had to measure the mass quickly...

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Akshay Patel 4/2/11 Period 1 Vapor Density Lab The possible sources of error in this lab include the use of tap water. It’s not distilled water, so the boiling point is not the same. The pin-sized hole maybe wasn’t big enough. The rate of effusion could have been lower. All the substance was probably not condensed. It was really difficult to tell. Also, drying off the flask completely affected the mass of the flask with the substance in it. If we had to measure the mass of the flask when the entire vapor is condensed, it would have made the task easier and hopefully more accurate. I doubt we dried off the flask completely because it was so hot and dangerous to touch. But
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Unformatted text preview: also, we had to measure the mass quickly so u can get accurate reading. So finding a perfect time was difficult. We found density and the molar mass by using the equations: MVP=mrT and the density with D = PM/RT We know that liquid will evaporate completely to a gas and the gas will take up the space of the flask. Using water-displacement, we found the mass of the flask with graduated cylinders. We found the mass of the gas by subtracting the flask with the substance, foil and rubber band, from the mass of the flask without the substance but with the rubber band and foil....
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