When 0.500 mol HC2H3O2 combined with water make 300.0 mL solution. What is the concentration?

To find the concentration of the solution, use the formula for molarity (M), which is moles of solute divided by the volume of solution in liters. Here, the moles of HC₂H₃O₂ is 0.500 mol, and the volume of the solution is 300.0 mL, which is 0.300 L. Thus, the concentration is ( M = \frac{0.500 , \text{mol}}{0.300 , \text{L}} = 1.67 , \text{M} ).