The Molecular Weight of a Volatile Liquid Abstract

The Molecular Weight of a Volatile Liquid Abstract - In...

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Abstract: The Molecular Weight of a Volatile Liquid The purpose of this experiment was to—through the application of the Ideal Gas Law (PV = nRT)—determine the molecular weight of an unknown, volatile liquid (unknown #14). The results of this lab yielded an average molecular weight of 73.11 g/mol with a standard deviation of 40.12, and a propagation of errors value of ± 0.5. The results are certainly less than stellar (considering that the values for the propagation of error and standard deviation vary greatly). Indeed, the propagation of errors attempts to account for the inherent limitations of the equipment used, so the poor results did not arise from bad equipment.
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Unformatted text preview: In looking at the data between trials, the observed temperature and volume covered a very limited range. The only significant variance in the data collected was in the change in mass of the flask, which could be accounted for by the fact that the initial amount of liquid used in each trial was not at all consistent; an estimation of about one-quarter of the liquid was poured into each flask, and this was hardly a scientific measurement. Additionally, the basis of this experiment was on the Ideal Gas Law and gases behave ideally at high temperature and low pressure. These were not the conditions under which the experiment was conducted....
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