Question

Assuming the density of the vinegar to be 1.3 g/mL, what was the percent (by mass) of acetic acid in the vinegar? 15.4ml sample of vinegar

Answer 1

\(\bf\Huge Welcome~to~\color{#00B4ff}{Open}\color{#7cc517}{Study}~!!!\)

So in 1 mL water, 1.3 gram acetic acid is dissolved.
You have 15.4 ml vinegar
First find out how much acetic acid is in 15.4 mL, just multiply with 1.3

Next divide by 15.4 and multiply by 100%