How many molecules of ethanol (C2H5OH) (the alcohol in alcoholic beverages) are present in 496 mL of ethanol? The density of ethanol is 0.789 g/cm3.

Question

How many molecules of ethanol (C₂H₅OH) (the alcohol in alcoholic beverages) are present in 496 mL of ethanol? The density of ethanol is 0.789 g/cm³.

Answer 1

496 ml EtOH x 0.789 g/ml = 391.2 g EtOH

301.3 g EtOH x 1 mol/46 g = 8.507 moles EtOH

8.507 moles x 6.02x10²³ molecules/mol = 5.13x10²⁴ molecules of ethanol