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M C8H18 = 114 g/mol
1 mol O2 = 22,4 dm^3
2*114 C8H18 ----- 25 * 22,4 dm^3 O2
1000g C8H18 ----- x
x= 1000 * 25 * 22,4 / 2*114 = 2456 dm^3 O2
2456 dm^3 ------ 20%
x ------100%
x = 2456/0,2 = 12 280 dm^3 powietrza