7. Anhydrous solid calcium chloride is frequently used in the laboratory as a drying agent for solvents, because it absorbs 6 moles of water molecules for every mole of calcium chloride used (forming the stable solid hydrated salt calcium chloride hexahydrate). Anhydrous calcium chloride is typically prepared by treating solid calcium carbonate with hydrogen chloride gas. A large amount of heat is generated by this reaction, so the water produced from the reaction is usually driven off as steam. Some liquid water may remain, however, and it may dissolve some of the desired calcium chloride. What is the percent yield if 405 g of calcium carbonate is treated with 250. g of anhydrous hydrogen chloride and only 242 g of CaCl2 is obtained?

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