Question

A 150.0 ml of sample of an aqueous solution at 25 degrees celcius contains 15.2 mg of unknown electrolyte compound. If the solution has an osmotic pressure of 8.44 torr, what is the molar mass of the unkown compound?\

Answer 1

Concepts and reason

Colligative property: It is a property that depends on the mass of the solute present in a solution; it does not depend on the nature of the solute. Osmotic pressure is an example of a colligative property.

Osmotic pressure is a colligative property, which depends upon the molarity of the solution. The osmotic pressure is denoted by.

Fundamentals

Osmotic pressure is a colligative property, which depends on the molarity of the solution.

The number of moles of the substance is the simple ratio of the mass to the molar mass of that substance. The osmotic pressure of the solution of molarity at temperature is represented as follows.

Given,

Therefore,

It is given that the mass of the unknown electrolyte is 15.2mg

Ans:

Molar mass of the unknown electrolyte is 223.2g/mol.