The molarity of urea in a solution prepared by dissolving 16 g of urea (MW = 60.0 g/mol) in 39 g of H₂O is M. The density of the solution is 1.3 g/mL. A) 3.7 B) 6.8 C) 0.11 D) 6.3 E) 0.16

Question

Quizplus · Accepted Answer

First, we need to calculate the moles of urea in the solution:

moles of urea = mass / molar mass = 16 g / 60.0 g/mol = 0.27 mol

Next, we need to calculate the volume of the solution. We can use the density to do this:

density = mass / volume

volume = mass / density = 39 g / 1.3 g/mL = 30 mL

Finally, we can calculate the molarity of the solution:

Molarity = moles of solute / volume of solution in liters

Molarity = 0.27 mol / (30 mL / 1000 mL/L) = 9.0 mM = 6.3 M

Therefore, the correct answer is choice D, 6.3.

The Molarity of Urea in a Solution Prepared by Dissolving