The freezing point of an aqueous solution that contains a non-electrolyte is -9.0 degrees celcious.

A. What is the freezing-point depression of the solution?

B. What is the molal concentration of the solution?

calculate the volume of solution that is needed to deliver 3.5ml of solute, hydrogen peroxide from a 1.5% (v/v) solution

A. The freezing-point depression of a solution is the difference between the freezing point of the pure solvent and the freezing point of the solution. In this case, the freezing point of the solution is given as -9.0 degrees Celsius. So, the freezing-point depression can be calculated by subtracting the freezing point of the pure solvent from the freezing point of the solution.

Freezing-point depression = Freezing point of pure solvent - Freezing point of solution
= 0 degrees Celsius - (-9.0 degrees Celsius)
= 9.0 degrees Celsius

Therefore, the freezing-point depression of the solution is 9.0 degrees Celsius.

B. The molal concentration of a solution is the amount of solute present in 1 kg of the solvent. To calculate the molal concentration, we need to know the molality constant of the solvent and the freezing-point depression.

Molality (m) = (Freezing-point depression)/(Molal constant)

To calculate the molality, we need the molal constant. Since the solute is a non-electrolyte, we can use the formula:

Molal constant = -K_f

where K_f is the cryoscopic constant of the solvent.

Without knowing the specific solvent, it is not possible to determine the molal constant or the molal concentration of the solution.

To find the freezing-point depression of the solution, we need to determine the difference between the freezing point of the pure solvent and the freezing point of the solution. In this case, the pure solvent is water, which has a freezing point of 0 degrees Celsius.

A. Freezing-point depression = Freezing point of pure solvent - Freezing point of solution
Freezing-point depression = 0 degrees Celsius - (-9.0 degrees Celsius)
Freezing-point depression = 9.0 degrees Celsius

Therefore, the freezing-point depression of the solution is 9.0 degrees Celsius.

To find the molal concentration of the solution, we need to calculate the number of moles of solute per kilogram of solvent. The molal concentration is expressed in moles of solute per kilogram of solvent.

B. Molal concentration = Moles of solute / Mass of solvent (in kilograms)

We do not have the information regarding the mass or number of moles of the solute. However, if we have this information, we can use it to calculate the molal concentration by dividing the number of moles of the solute by the mass of the solvent in kilograms.

For example, if you know the number of moles of the solute is n and the mass of the solvent is m grams, you can convert the mass to kilograms by dividing by 1000. Then, you can calculate the molal concentration using the formula:

Molal concentration = n / (m/1000)

Please provide the values of the moles of solute and mass of the solvent if you have them to calculate the molal concentration.