What is the number of moles of solute present in 650 mL of a 0.40 molar (M) solution?

• A. 0.16 mol
• B. 0.40 mol
• C. 1.63 mol
• D. 0.26 mol

Answer: (D)

Verified step by step guidance

1. Recall that molarity (M) is defined as the number of moles of solute per liter of solution. The formula is: \(M = \frac{\text{moles of solute}}{\text{liters of solution}}\).
2. Rearrange the formula to solve for moles of solute: \(\text{moles of solute} = M \times \text{liters of solution}\).
3. Convert the given volume from milliliters to liters because molarity uses liters: \$650\ \text{mL} = \frac{650}{1000} = 0.650\ \text{L}$.
4. Substitute the given values into the rearranged formula: \(\text{moles of solute} = 0.40\ \text{mol/L} \times 0.650\ \text{L}\).
5. Multiply the molarity by the volume in liters to find the number of moles of solute present in the solution.