American Chemical Society Exam Chemistry

Question Description

Benzene, C6H6, reacts with oxygen, O2, to form CO2 and H2O. How much O2 is required for the complete combustion of 1.0 mol C6H6?

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Final Answer

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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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simsiple (622)
Boston College

I was struggling with this subject, and this helped me a ton!