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Propane burns in air according to the fo...

Propane burns in air according to the following equation :
`C_3H_8 +5O_2 rarr 3CO_2 + 4H_2O`.
What volume of propane is consumed on using 1000 `cm^3` of air, considering only 20% of air contains oxygen ?

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`40cm^(3)`
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