How many moles of solute are contained in a 250.0 ml solution with a concentration of 2.5 ml?

To calculate the moles of solute, you first need to convert the volume of the solution from milliliters to liters (250.0 ml = 0.250 L). Then you can use the formula moles = Molarity x Volume (in liters) to find the moles of solute. Given the concentration of 2.5 M, you would have 0.625 moles of solute in the solution.