Answer:
Before we go through this I ask you carefully read every thing I've listed out or it's not going to make sense for you.
The equation:
CO2 and O2 aren't reacting with each other. One is a product and the other is a reactant. You're probably asking for how much CO2 will be formed with 17 moles of O2. It's pretty simple.
First you have to find the mole to mole ratio of O2 to CO2 (look at their coefficients/numbers right in front of their names), the ratio is 9 : 6, so for every 9 of oxygen gas (O2), 6 of carbon dioxide (CO2) is made. We have 17 moles of oxygen so if we divide it by 9 (mole ratio of oxygen gas) and multiply it by 6, we will get the amount of CO2 produced.
(17/9) x 6 ≈ 11.3 moles of CO2 are made.
In the case that you actually meant to say C3H7OH (Propanol) reacting with oxygen, I'll write that down here too:
The mole to mole ratio of Propanol to Oxygen gas is 2 : 9 (look at the coefficients) so we divide 17 moles of oxygen by 9 and then multiply it by 2, which will give us the amount of Propanol needed.
(17/9) x 2 = 3.78 moles of Propanol is required to react with oxygen.