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For the given problem there isn't much $\ce{CO}$ created. Given that the question is multiple choice an exact amount isn't needed. The problem only needs to be solve close enough to determine which choice is the answer. So assume complete combustion and then guess that the answer will be about 5% high. If octane, $\ce{C8H18}$, is completely burned with ...


First, kudos for actually showing work on a problem! Second, I'd solve this by inspection, rather than using the Ideal Gas Law, where time is critical on a test. As you correctly calculated, the limiting reactant is $\ce{H2}$. Therefore the pressure of $\ce{H2}$ is nil; all the $\ce{H2}$ is in the water. Half of the $\ce{O2}$ is used, reacting with the $\...

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