solving a reactant using a chemical equation

Question

Wine goes bad soon after opening because the ethanol CH3CH2OH

 in it reacts with oxygen gas O2 from the air to form water H2O and acetic acid CH3COOH, the main ingredient of vinegar.

What mass of water is produced by the reaction of 

1.2g of oxygen gas?

Answer 1

CH3CH2OH + O₂ ==> H₂O + CH3COOH ... balanced equation

1.2 g O₂ x 1 mol O₂ / 32 g x 1 mol H₂O / mol O₂ x 18 g H₂O / mol = 0.68 g H₂O