Convert 11.5 grams of ethanol, C2H5OH, to molecules of ethanol.\

Answer 1

Use Avogadro's number: 6.02x10²³ molecules per mole

First find moles of C₂H₅OH in 11.5 g

molar mass C₂H₅OH = 46.07 g/mole

11.5 g x 1 mol/46.07 g = 0.2496 moles

Converting to molecules:

0.2496 moles x 6.02x10²³ molecules / mole = 1.50x10²³ molecules