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500 mL of 2 M NaCl is combined with 200 mL of 0.25 M NaCl. What is the molarity of NaCl in the resulting mixture?

1. 1.50 M
2. 1.21 M
3. 1.75 M
4. 2.25 M

Correct answer: 1.50 M

Solution

Total moles = 0.5*2 + 0.2*0.25 = 1.05 mol in 0.7 L, giving 1.5 M.

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