Answer:
7%
Step-by-step explanation:
To calculate the percent by volume of a solution, we need to know the volume of solute and the total volume of the solution.
In this case, the volume of solute is 10.5 mL of HI, and the total volume of the solution is 10.5 mL + 139.5 mL = 150 mL.
The percent by volume is then calculated as:
% by volume = (volume of solute / total volume of solution) × 100%
% by volume = (10.5 mL / 150 mL) × 100%
% by volume = 7%
Therefore, the % by volume of the solution is 7%.