Answer:
about 1,232 L
Explanation:
Okay! I wasn't sure if you still needed an answer, but I figured I'd throw my two sense in.
To answers this question, you have to know that there are about 1 mole of 02 per 22.4 liters.
Knowing this, we use stoichiometry to figure out how many moles of o2 react with c3h8.

So we have 55 moles of o2!
So then we just convert 55 moles into liters.
55 moles * 22.4L/1 mole o2= 1,232L