Calculate the amount of CO2 (in moles) that could be obtained from 5 moles of propane gas that burns in excess oxygen

Answer 1

Propane = C₃H₈

Combustion of propane is C₃H₈ + 5O₂ ==> 3CO₂ + 4H₂O

5 mol C₃H₈ x 3 mol CO₂/mole C₃H₈ = 15 moles CO₂

Since 5 moles propane has only 1 sig fig, the answer should be reported as 20 moles CO₂ (1sig fig)