What mass of oxygen gas is consumed by the reaction of 8.35g

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 oxygen gas is consumed by the reaction of 

8.35g

 of ethanol?Be sure your answer has the correct number of significant digits.

Answer 1

the first step is to write the correct balanced equation

C2H6O+O2 --> H2O +C2H4O2

8.35 g ethanol X (1 mol ethanol/ 46.07 g) X ( 1 mol O2/ 1 mol ethanol) X ( 32 g /1 mol O2)= 5.80 g (3 sig figs)