Question

An aqueous NaCl solution weighs 453 g. The mass of dissolved NaCl is 12.45 g. What is the mass percent of NaCl?

Answer 1

To calculate the mass percent of NaCl in the solution, use the formula:

Mass percent = (mass of NaCl / total mass of solution) x 100

First, find the total mass of the solution by subtracting the mass of dissolved NaCl from the total solution weight:
Total mass of solution = 453 g - 12.45 g = 440.55 g

Now, plug the values into the formula:
Mass percent = (12.45 g / 440.55 g) x 100 = 2.82%

Therefore, the mass percent of NaCl in the aqueous solution is 2.82%.