The density of ethyl alcohol (200 proof, or pure alcohol) is 0.789 g/mL at 20°C. Calculate the mass of a 19.6 mL sample. Enter your answer in the provided box.

Question

The density of ethyl alcohol (200 proof, or pure alcohol) is 0.789 g/mL at 20°C. Calculate the mass of a 19.6 mL sample. Enter your answer in the provided box.

Answer 1

You can easily use dimensional analysis to answer this question.

19.6 ml x 0.789 g/ml = 15.46 g = 15.5 g (to 3 significant figures)