How many g of O2 will react with 8 mil of ethanol?

Answer 1

I think you meant to type "mol" of ethanol.

Write the balanced chemical reaction.

C₂H₅OH + 3 O₂ → 2 CO₂ + 3 H₂O

From the balanced reaction, it takes 3 mol of O₂ to react with 1 mol of C₂H₅OH. This ratio is your mole ratio to convert mol of ethanol to mol of O₂.

8 mol C₂H₅OH x (3 mol O₂ / 1 mol C₂H₅OH) = 24 mol O₂

Molar mass of O₂ is 32 g/mol. Convert mol O₂ to g O₂

24 mol O₂ x (32 g O₂ / 1 mol O₂) = 768 g O₂ (~ 800 g O₂ to 1 significant figure)