What is the concentration (M)of a NaCl solution prepared by dissolving 9.3 g of NaCl in sufficient water to give 350 mL of solution? A)18 B)0.16 C)0.45 D)27 E)2.7 × 10^-2

Question

Quizplus · Accepted Answer

First, convert the given mass of NaCl into moles:

9.3 g NaCl x (1 mol NaCl / 58.44 g NaCl) = 0.159 mol NaCl

Next, calculate the concentration in units of moles per liter (M):

0.159 mol NaCl / 0.350 L = 0.454 M

Round this to two significant figures and the answer is 0.45 M, which corresponds to choice C.

What Is the Concentration (M)of a NaCl Solution Prepared by Dissolving