Question

How many molecules of carbon dioxide will be produced if 20 molecules of propane react?

Answer 1

Answer:

60 such molecules........

Explanation:

You need a stoichiometrically balanced equation to represent the combustion:

C3H8(g)+502(g)=3CO2(g)+4H2O(l)

So are charge and mass balanced here?

Clearly, the reaction specifies 3 equiv of carbon dioxide per equiv of propane. If we start with 20 molecules of propane, these will necessarily be 60 carbon dioxide product molecules upon complete combustion.