A 71.08-g sample of NaCl is dissolved in 250.0 mL of solution. Calculate the molarity of this solution.
A) 1.216 M
B) 284.3 M
C) 4.865 M
D) 6.098 M
E) none of these

Question

Quizplus · Accepted Answer

First, we need to convert the mass of NaCl into moles:

71.08 g NaCl x (1 mol NaCl/ 58.44 g NaCl) = 1.217 mol NaCl

Now, we need to calculate the volume of solution in liters:

250.0 mL x (1 L/ 1000 mL) = 0.250 L

Finally, we can calculate the molarity of the solution:

Molarity = moles of solute / liters of solution
Molarity = 1.217 mol / 0.250 L = 4.868 M

The answer to the nearest thousandth is 4.865 M, which is choice C.

A 7108-G Sample of NaCl Is Dissolved in 250