2.0 mol of propane, C3H8, reacts with 8.0 mol of oxygen gas in a combustion reaction producing carbon dioxide and water. Calculate the theoretical yield of carbon dioxide.

Answer 1

Oxygen is the limiting reactant.

To find the limiting reactant divide the number of moles with their coefficient in the balanced equation, whatever reactant has the lower value is the LR

1 C3H8 + 5 O2 ----------------- 3 CO2 + 4 H2O

8.0 mol Oxygen 3 mol Carbon dioxide 44 g of Carbon dioxide

5 moles of Oxygen 1 mol Carbon dioxide

8*3*44

5*1

= 211 grams of Carbondioxide