What is the molarity of a solution containing 4.2 mol of NaCl dissolved in 2.3 L of solution?

• A. 6.5 M
• B. 1.83 M
• C. 2.3 M
• D. 0.55 M

Answer: (B)

Verified step by step guidance

1. Identify the formula for molarity, which is defined as the number of moles of solute divided by the volume of the solution in liters: \(M = \frac{\text{moles of solute}}{\text{volume of solution in liters}}\).
2. Note the given values: moles of NaCl = 4.2 mol, and volume of solution = 2.3 L.
3. Substitute the given values into the molarity formula: \(M = \frac{4.2\ \text{mol}}{2.3\ \text{L}}\).
4. Perform the division to find the molarity (do not calculate the final number here, just set up the expression).
5. Interpret the result as the concentration of the NaCl solution in moles per liter (M), which tells you how many moles of NaCl are present in each liter of solution.