A solution of nonvolatile solute has an osmotic pressure of 141 mmHg at 25 °C.What is the molarity of the solution?
A)0.00759 M
B)5.76 M
C)0.0904 M
D)0.0339 M
E)0.174 M

Question

Quizplus · Accepted Answer

The osmotic pressure (π) can be calculated using the formula π = MRT, where M is molarity, R is the ideal gas constant (0.0821 L·atm/mol·K), and T is the temperature in Kelvin. Converting 25 °C to Kelvin gives 298 K. Converting 141 mmHg to atm gives 0.185 atm. Solving for M gives M = π / (RT) = 0.185 / (0.0821 * 298) = 0.00759 M.

A Solution of Nonvolatile Solute Has an Osmotic Pressure of 141