How many moles of solute are present in 50.0 mL of 0.20 M KNO_3 solution?

• A. 0.100 mol
• B. 0.005 mol
• C. 0.020 mol
• D. 0.010 mol

Answer: (D)

Verified step by step guidance

1. Identify the given information: the volume of the solution is 50.0 mL and the molarity (M) of the KNO_3 solution is 0.20 M.
2. Convert the volume from milliliters to liters because molarity is expressed in moles per liter. Use the conversion: \$1\, \text{L} = 1000\, \text{mL}\(. So, \)50.0\, \text{mL} = \frac{50.0}{1000} = 0.0500\, \text{L}$.
3. Recall the definition of molarity: \(M = \frac{\text{moles of solute}}{\text{liters of solution}}\). Rearranged to find moles of solute, it becomes \(\text{moles of solute} = M \times \text{liters of solution}\).
4. Substitute the known values into the equation: \(\text{moles of solute} = 0.20\, M \times 0.0500\, L\).
5. Calculate the product to find the number of moles of KNO_3 in the solution (do not compute the final value here, just set up the expression).