3.12%
Explanation:
Mass percent is defined as 100 times the ratio between mass of solute (In this case, acetic acid) and total mass of the solution (Mass of solute + Mass of solvent). The equation is:
Mass percent = Mass solute / Total mass * 100
Replacing:
3.06g Acetic Acid / 98.05g * 100
3.12%No, 50ml weighs around 50g
So it is not accurate