A student requires 0.380 moles of NaCl that has a concentration of 0.750M. How many Liters of the solution should be used?

The correct answer is 0.506 L

Explanation:

The solution has a molarity of 0.750 M. That means that there are 0.750 moles of solute (NaCl) per liter of solution:

0.750 M = 0.750 moles NaCl / 1 liter solution

If the student needs 0.380 moles-which is lesser than 0.750 moles - less than 1 liter of solution should be used. We can calculate the volume in liters the student needs by simply dividing the moles into the molarity of solution as follows:

V = 0.380 moles NaCl x (1 L/0.750 moles NaCl) = 0.506 L