If the mass of solute 9.0 and the volume of solution is 250 mL, what is the solute's percent?

To find the solute's percent, you need to know the mass of the solute and the total mass of the solution. Since the question only provides the mass of the solute (9.0) and the volume of the solution (250 mL), you need to make an additional assumption to calculate the solute's percentage. The assumption is that the density of the solution is known or can be determined.

Assuming you know the density of the solution, you can calculate the total mass of the solution by multiplying the density (in grams per milliliter) with the volume of the solution (in milliliters). Let's say the density of the solution is 1.0 g/mL, then:

Total mass of the solution = Density × Volume of the solution
Total mass = 1.0 g/mL × 250 mL
Total mass = 250 grams

Once you have the total mass of the solution, you can calculate the solute's percentage using the formula:

Solute percentage = (Solute mass / Total mass) x 100

In this case, the solute mass is 9.0 grams and the total mass is 250 grams. Plugging in these values into the formula, you'll get:

Solute percentage = (9.0 g / 250 g) × 100

Simplifying the calculation:

Solute percentage = 0.036 × 100
Solute percentage ≈ 3.6%

Therefore, the solute's percentage in the solution is approximately 3.6%.