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a. A solution of common salt, NaCl, in water has a concentration of 0.0921 M. Calculate the number of moles of NaCl contained in 50.0 mL of this solution.
b. If, instead, an NaCl solution is prepared by dissolving 10.0 g of solid NaCl in enough water to make 250. mL of solution, what is the molarity?
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