Question

When 9.6 grams of NaBr are dissolved in enough water to create a 165-gram solution, what is the solution's concentration, expressed as a percent by mass?

4.8% NaBr

5.5% NaBr

5.8% NaBr

6.2% NaBr

Answer 1

5.8% NaBr. 165 - 9.6 = 155.4, 155.4/165 = .942 (94.2%), and 100% - 94.2% = 5.8%.

Answer 2

thank you