To determine the mass of solute, we need more information:1. *Concentration*: Is it a percentage (w/v or w/w), molarity, or another unit?2. *Solute*: What is the substance dissolved in the solution?If you provide the concentration and solute, I can help calculate the mass.For example, if it's a 13% w/v solution (13 grams of solute per 100 mL of solution), the calculation would be:Mass of solute = (13 g/100 mL) × 250 mL = 32.5 gNeed:Please provide more details for a precise calculation.