A solution is prepared by dissolving 1.928 g of KNO3 into enough water to make 651 mL.What is the molarity of the solution?
A) 0.159 M
B) 0.381 M
C) 0.0293 M
D) 2.48 M
E) 0.0832 M

Question

Quizplus · Accepted Answer

Molarity (M) = moles of solute ÷ liters of solution

First, we need to determine the number of moles of KNO3:

m = mass ÷ molar mass
m = 1.928 g ÷ 101.1 g/mol (molar mass of KNO3)
m = 0.019 mol

Next, we convert the given volume from mL to L:

651 mL ÷ 1000 mL/L = 0.651 L

Now we can calculate the molarity:

M = 0.019 mol ÷ 0.651 L
M = 0.0293 M

Therefore, the correct answer is choice C.

A Solution Is Prepared by Dissolving 1