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What is the molarity of a sodium chloride solution that contains 5.85 g of NaCl in 500 mL of solution?

1. 0.25 M
2. 2.0 M
3. 1.0 M
4. 0.2 M

Correct answer: 0.2 M

Solution

5.85 g NaCl is 0.1 mol; in 0.5 L this gives 0.1/0.5 = 0.2 M.

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