4 g of sodium hydroxide (M = 40 g/mol) is dissolved to make 0.5 L of solution. What is the concentration?

Answer and explanation

Correct answer: C. 0.2 mol/L

  1. Step 1: Moles are mol. Step 2. Concentration is mol/L. Answer: 0.2 mol/L. Why not the others: 0.1 is the number of moles, 0.8 multiplies by 8, and 5 divides incorrectly.

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