postlab2 - Laura Lanier Post – Lab 2 Lab L2 In a closed...

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Unformatted text preview: Laura Lanier Post – Lab 2 Lab L2 In a closed system, no matter can be lost or made; this is the law of conservation of mass, a fundamental law in the study of chemistry. This law allows chemists to use stoichiometry to discover the compounds that are reacting, how much product should be produced, or how much of one reactant should be left over after the reaction has run its course. In this experiment, the law of conservation of mass facilitated the discovery of a hydrated salt through calculation of the compound both in the hydrated and the anhydrous state. The compound was heated three times; before the first heating, the substance was a translucent white and clearly crystallized and of a mass of 23.490 g (with crucible and lid). After the first heating, it was more opaquely white and powdery with a mass of 23.210; after subsequent heatings, the mass was 23.208 and 23.215 respectively. The difference in mass after heating can be explained by the evaporation of water, leaving behind the anhydrous salt. The identity of the compound can be discovered evaporation of water, leaving behind the anhydrous salt....
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