Formula Weight of a Compound.docx - Formula Weight of a...

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Formula Weight of a Compound Objective: To determine the formula weight of a compound by applying stoichiometric of its chemical reaction with zinc. Pre-Lab Questions: Pre-Lab questions were attached. Introduction: The molar mass of a compound equals mass of a compound divided by number of moles of a compound. One copper compound is designated the formula as CuX, and the identity of the anionic part of the compound X is unknown. So the formula weight of the compound cannot be determined because of the unknown moles. In this case, Cu:X=1:1. Therefore, if we know how many moles of Cu, we also know how many moles of CuX. The method to get the copper is replacement experiment. The first step is dissolve the compound in the water. Water ionized the compound: CuX (s) → Cu +2 (aq) + X -2 (aq) After dissolving the sample of the weighed compound in water, zinc metal was added into the solution. A single replacement reaction will occur: Zn (s) + Cu +2 (aq) → Zn +2 (aq) + Cu (s) Then the Cu +2 is the product after dissolving the sample compound in water.
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After filtering the colorless solution (Zn +2 is colorless), drying and weighing the metallic copper. The molar mass of CuX can be calculated as:
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