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
5.8
To determine the solution's concentration as a percent by mass, we need to calculate the mass of NaBr in the solution and express it as a percentage of the total mass of the solution.
To do this, we can use the formula:
Concentration (percent by mass) = (mass of solute / mass of solution) × 100
Given that 9.6 grams of NaBr are dissolved in a 165-gram solution, we can calculate the concentration:
Concentration (percent by mass) = (9.6 g / 165 g) × 100
Now we can solve the equation:
Concentration (percent by mass) ≈ 5.8182%
Therefore, the solution's concentration, expressed as a percent by mass, is approximately 5.8% NaBr.