Equations with Molecules

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{Please rememeber to read the numbers as subscripts in the chemical formulae}.
The "combustion" of butane(formula C4H10)-- which is basically burning butane in oxygen---proceeds according to the reaction below.

2 C4H10 + 13 O2 → 8 CO2 + 10 H2O

2 moles C4H10 react with 13 moles O2 ...