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2C6H6 + 15O2 ---> 12CO2 + 6H2O
from the balanced equation, the ratio between any 2 substances can be determined by taking the coefficients in front of each.
for example, the ratio between Oxygen and propane is 15 : 2, which means there are 15 moles of O2 required to completely react with 2 mole of C6H6.
if 2 moles of C6H6 can be combusted using 15 moles of O2,then 1 mole of C6H6 will combusted using 7.5 moles of O2
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