At 25°C,what is the osmotic pressure of a homogeneous solution consisting of 18.0 g urea (CON₂H₄)diluted with water to 3.00 L? (R = 0.0821 L.atm/mol.K)

Question

Quizplus · Accepted Answer

First, we need to find the molarity of the solution:
n(urea) = mass/molecular weight
n(urea) = 18.0 g / 60.06 g/mol = 0.2996 mol

Molarity = n/V
Molarity = 0.2996 mol / 3.00 L = 0.0999 M

Now, we can use the van't Hoff factor (i) to calculate the effective concentration of particles in solution:

i = 1 (urea does not dissociate in water)

π = iMRT
π = (1)(0.0999 M)(0.0821 L.atm/mol.K)(298 K)
π = 2.44 atm

Therefore, the osmotic pressure of the solution is 2.44 atm, which corresponds to choice B.

At 25°C,what Is the Osmotic Pressure of a Homogeneous Solution