Question

What is the percentage by mass of solution formed by dissolving 36.0 grams of HCl in 98.0 grams of water? (4 points) a73.1% b36.7% c26.9% d24.2%

Answer 1

c. 26.9%

Step-by-step explanation:

1st) To calculate the percentage by mass of a solution, it is necessary to use the grams of solue and the grams of solution.

The information given in the exercise is:

- Mass of solute (HCl): 36.0g

- Mass of solvent (water): 98.0g

We need the mass of solution, so it is necessary to add the mass of solute to mass of solvent, that is the mass of solution:

`\begin{gathered} \text{ Mass of solution = Mass of solute + Mass of solvent} \\ \text{ Mass of solution = }36.0g\text{ + }98.0g \\ \text{ Mass of solution = 134.0g} \end{gathered}`

2nd) Now we have to replace the values in the formula to calculate the percentage by mass of the solution:

`\begin{gathered} \text{ Percent by mass =}\frac{\text{ Mass of solute}}{\text{ Mass of solution}}*100 \\ \text{ Percent by mass = }(36.0g)/(134.0g)*100 \\ \text{ Percent by mass = 26.9}\% \end{gathered}`

Finally, the percentage by mass of the solution is 26.9%.