Stoichiomerty combustion of acetylene

Question

Grams of oxygen (o2) take to produce 9.60 mole of carbon dioxide (CO2)?

Answer 1

Using dimensional analysis:

9.60 mol CO₂ x 2 mol O/mol CO₂ x 16 g O/mol O = 307 g of oxygen. But your question asks a rather strange question as it asks for grams of diatomic oxygen (O₂). That would be 1/2 of the 307 grams, but it doesn't really make sense.