Answer to Question #151398 in Chemistry for Ashton Foley

Question

15 g of solute are dissolved in 85 mL of water. What is the percent by mass concentration of the solution?

Answer 1

Solution:

Percent by mass = (mass of solute / mass of solution) × 100%

The mass of solute is 15 grams.

Mass of solution = Mass of solute + Mass of water

Since the mass of 85 ml of water is 85 grams, then:

Mass of solution = 15 g + 85 g = 100 g

Hence,

Percent by mass = (15 g / 100 g) × 100% = 15%

Answer: The percent by mass concentration of the solution is 15%.