Lab#3 - The Law of Definite Proportions and Empirical...

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The Law of Definite Proportions and Empirical Formulas Experiment 3 September 21, 2007
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1. The two heating steps are not identical, because the mass of copper per gram of sulfur in the compound differs. This is probably due to the sulfur we added for the second heating. However they are similar and when we calculate the fractional uncertainties and uncertainties of the copper, sulfur, and copper-to-sulfur ratio, we get identical results. 2. This experiment does successfully demonstrate the law of definite composition, because we see that in both the first and second heating, the empirical formula of the copper-sulfur compound is identical. In other words, in every compound that contains copper and sulfur, there will always be two moles of copper for every mole of sulfur, according to the law of definite proportions. 3. We are certain that the amount of copper in the crucible remains constant, because during both our first and second heating, we never physically affected the copper in the
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This note was uploaded on 04/12/2008 for the course CHE 1121 taught by Professor Guo during the Fall '07 term at St. Johns Duplicate.

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Lab#3 - The Law of Definite Proportions and Empirical...

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