Consider the unbalanced equation for the combustion of hexane:
2c6h14(g)+19o2(g)→12co2(g)+14h2o(g) determine how many moles of o2 are required to react completely with 7.9 moles c6h14.

The balanced equation is C6H14(g) + 19/2O2(g) → 6CO2(g) + 7H2O(g). If you are given 7.9 moles C6H14, multiply it by a ratio of 19/2/1 to get the moles of oxygen. Then, you will get 75.05 moles of O2.

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