how many moles of carbon dioxide are formed from 3.0 moles of propane ?

Answer 1

I need more information to answer this
like the *chemical equation*

Answer 2

First of all, you have to balance the chemical equation. That means, every atom on the left-hand side has to be accounted for on the right-hand side. If it helps, write everything out in full and cross out the same things on both sides.

We know we have C3H8 on the left-hand side and CO2 on the right-hand side:

CCCHHHHHHHH + ?? -> COO + ??

Obviously we have 3 atoms of carbon on the LHS, so we need to have 3 carbons on the RHS; we will also need some oxygen on the LHS, and we'll take care of the hydrogen by turning it into water:

CCCHHHHHHHH + ?? -> COO COO COO + HOH HOH HOH HOH

Now the only thing left unaccounted for is the oxygen. We have 10 atoms of oxygen on the RHS (six in the carbon dioxide and four in the water) and none on the LHS, meaning we must have added 5 O2 molecules:

C3H8 + 5O2 -> 3CO2 + 4H2O

So we get 3 molecules of CO2 for each molecule of propane. And remember, a mole is just 602 214 179 000 000 000 000 000 molecules or atoms. So we could just as well say we get 3 moles of CO2 for every one mole of propane we started with.

And if we started with 3 moles of propane, then we would end up with ..... ?

Answer 3

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

If this is the equation of the chemical reaction, you can produce 9 moles of Carbon Dioxide.