Procaine hydrochloride (ℳ = 272.77 g/mol) is used as a local anesthetic. Calculate the molarity of a 4.666 m solution which has a density of 1.1066 g/mL.
A)2.272 M
B)4.056 M
C)4.216 M
D)4.666 M
E)None of these choices are correct.

Question

Quizplus · Accepted Answer

The correct answer is A because the molarity of a solution is calculated by dividing the moles of solute by the volume of the solution in liters. The moles of solute can be calculated by dividing the mass of the solute by its molar mass. The volume of the solution can be calculated by dividing the mass of the solution by its density. In this case, the mass of the solute is 4.666 g, the molar mass of the solute is 272.77 g/mol, the mass of the solution is 1.1066 g/mL, and the density of the solution is 1.1066 g/mL. Therefore, the molarity of the solution is 2.272 M.

Procaine Hydrochloride (ℳ = 272