Mass in Chemistry

Question

What mass (in g) of ethanol, CH3CH2OH, contains 12.5 g of carbon?

Answer 1

12.5 g C x 1 mole C/12.0 g = 1.042 moles C

1.042 moles C x 1 mole CH3CH2OH/2 moles C = 0.521 moles ethanol

0.521 moles ethanol x 46.07 g/mole = 24.0 g of ethanol contains 12.5 g of carbon