Calculate the percent by mass of the solute in each of the following aqueous solutions.
(a) 5.10 g of NaBr in 78.2 g of solution
[5.10g/(5.10+78.2)]*100 = ?
To calculate the percent by mass of the solute in a solution, we need to determine the mass of the solute and the mass of the solution.
In this case, we are given that the mass of NaBr (solute) is 5.10 g and the mass of the solution is 78.2 g.
To calculate the percent by mass, we use the formula:
Percent by mass of solute = (mass of solute / mass of solution) * 100%
Let's plug in the values:
Percent by mass of solute = (5.10 g / 78.2 g) * 100%
Now, we can calculate the answer:
Percent by mass of solute = (0.06525679758) * 100%
Percent by mass of solute ≈ 6.53%
Therefore, the percent by mass of NaBr in this solution is approximately 6.53%.