Answer:
The mass of the rubbing alcohol is 14.77 g
Explanation:
The formula to be used here is that of density which is shown below
Density = Mass ÷ volume
The density of the rubbing alcohol (also known as isopropyl alcohol) is given in the question as 0.79 g/ml while the volume of same is given as 18.7ml. The mass of this rubbing alcohol is the unknown (which we can derive from the formula given earlier).
Hence,
Mass = Density × volume
Mass = 0.79 × 18.7
Mass = 14.77 g
