Hexane has the formula C_{6}H_{14}, and in complete combustion (reaction with oxygen) the only products are carbon dioxide and water:C_{6}H_{14 }+ xO_{2} -> yCO_{2} + zH_{2}Owhere x, y and z are molar ratios. The equation can be balanced by examining the carbon, hydrogen and then the oxygen atoms individually on each side of the equation . This gives a final formula:C_{6}H_{14 }+ 19/2O_{2} -> 6CO_{2} + 7H_{2}O. Obviously multiples would be correct if molar ratios were consistent.

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