Help me Please....how many moles produced???

Question

how many moles of CO2 can be produced from 2 moles of C3H8?

C2H8 + 5O2 -----> 3CO2 + 4H2O

I have an answer but i am not sure if it is right...i have 6 but then i also have 3

is the answer the combination of both sides or just one side? if it is both it is 6 if it is one side it is 3.

Answer 1

When the mole is used to specify the amount of a substance, the kind of elementary entities (particles) in the substance must be identified. The particles can be atoms, molecules, ions, formula units, electrons, photons or other particles.

A chemical reaction equation shows the molecules of each substance - not mass, not volume, but number of molecules. Since a mole is an indication of atoms or molecules etc (as listed above)..... you can interchange a molecule for a mole in a chemical equation.

So C3H8 denots 1 molecule of propane. Or 1 mole. It results in 3 moles of CO2 (and 4 moles of water). Hence 2 moles of propane = 2x3 = 6 moles of CO2.

Answer 2

First, get the formula correct-

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

That gives you the answer: you get 3 moles of CO2 for every mole of C3H8. Since your question was for how many moles of CO2 can be produced from 2 moles of C3H8, the correct answer is 6.

Answer 3

Your equation has a small mistake. 2 moles of propane will give 6 moles of CO2, because 1 mole gives 3.

Look at ratios - the numbers in front. Do not worry about "combinations".