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Molecular Formula

what volume o...

Question

what volume of oxygen gas measured at 0 C and 1 atm, is needed to burn completely 1L of propane gas measured under the same conditions?

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Solution

Burning of propane:

C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
1 mole 5 mole
(at STP) 22.4 L 5X22.4 L

So at STP,
to burn 22.4 L propane 5X22.4 L oxygen is needed
to burn 1 L propane 5X22.4/22.4 L oxygen is needed = 5 L oxygen is needed

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