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CHEMISTRY 121 1 Department of Chemistry University of British Columbia Problem Set 6 Molecular Identification Problems 1. Heating calcium carbonate yields a solid compound A (molecular weight = 56.1 g/mol) and a gas B . 0.5 mole of compound A reacts with 0.5 mole of water to give 0.5 mole of compound C . Reacting 0.5 mole of compound B with 0.5 mole of C yields 0.5 mole of compound D and 0.5 mole of water. What are A , B , C and D ? 2. A sample of sulfur dioxide is treated with water to give a solution of compound E . When 0.1 mol of compound E dissolved in water is treated with 0.2 mol of NaOH, 0.1 mol of compound F (molecular weight = 126 g/mol) is formed. Boiling this solution of F in the presence of 0.0125 mol of elemental sulfur (S 8 ) gives compound G as the sole product. (a) Identify E , F , and G . (b) Draw Lewis structures, including all non-zero formal charges and resonance forms, of E and the anions of F and G . 3. Aluminum metal was burned in excess chlorine gas in a tube furnace and a white solid was deposited on the surface of the glass tube (compound H ). Analysis of compound H revealed that its molar mass was 267 g/mol. 5.3 grams of compound
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