Based on the balanced reaction equation, 9 moles of carbon dioxide are formed when 3 moles of propane are combusted.
From the balanced reaction equation we can see that 3 moles of carbon dioxide are formed upon the combustion of a single mol of propane:
C₃H₈ + 5 O₂ → 3 CO₂ + 4 H₂O
These molar ratios are constant and enable us to set up a simple proportion:
1 mol of propane : 3 mol of carbon dioxide = 3 mol of propane : X
X = 3 mol of carbon dioxide * 3 mol of propane / 1 mol of propane
X = 9 mol of carbon dioxide
You can learn more about balanced reaction equations here:
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