Based on this equation; ___ C3H8 + ___ O2 --> ___ CO2 + ___ H2O How many moles of C3H8 are needed to make 13.5 moles of CO2? How much O2 is needed? Answer; mol C3H8 Answer; mol O2

Answer 1

First, BALANCE the equation:

C₃H₈ + 5O₂ ==> 3CO₂ + 4H₂O ... balanced equation

Next, note the mole ratio between C₃H₈ and CO₂. It is 1 to 3, so it takes 1 mol C₃H₈ to produce 3 mols CO₂

Use this ratio to solve the problem:

13.5 moles CO₂ x 1 mol C₃H₈ / 3 mols CO₂ = 4.5 mols C₃H₈ needed