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Verified answer
A. C3H8 + 5O2 -> 3CO2 + 4H2OB. mol propana = 4/22,4 = 0,178 mol
mol O2 = 5 x 0,178 = 0,89 mol
V1 /V2 = n1/n2
4/V2 = 0,178/0,89
V2 = 20 liter