The molarity of a solution of 5.0 g of KCl in 100.mL of solution is ________.
A)0.038 M
B)0.067 M
C)0.67 M
D)0.13 M
E)1.3 M

Question

Quizplus · Accepted Answer

First, we need to calculate the number of moles of KCl:
mass of KCl = 5.0 g
molar mass of KCl = 74.55 g/mol (39.10 g/mol for K + 35.45 g/mol for Cl)
moles of KCl = mass/molar mass = 5.0 g/74.55 g/mol = 0.067 moles

Next, we need to calculate the volume of the solution in liters:
100 mL = 0.1 L

Finally, we can calculate the molarity of the solution:
molarity = moles of solute/volume of solution in liters
molarity = 0.067 moles/0.1 L = 0.67 M

Therefore, the answer is C.

The Molarity of a Solution of 5