Answer to Question #337116 in Chemistry for ash

Question

An aqueous solution of sodium bromide, NaBr, contains 3.40 grams of sodium bromide and 17.4 grams of water.

The percentage by mass of sodium bromide in the solution is   %.

Answer 1

Solution:

Mass of solute = Mass of NaBr = 3.40 g

Mass of solution = Mass of NaBr + Mass of H₂O = 3.40 g + 17.4 g = 20.8 g

%NaBr = (Mass of NaBr / Mass of solution) × 100%

%NaBr = (3.40 g / 20.8 g) × 100% = 16.3%

%NaBr = 16.3%

Answer: The percentage by mass of sodium bromide in the solution is 16.3%