How many moles of oxygen are required for the complete combustion of one mole of propane, C$_3$H$_8$?
A4
B3
C5CORRECT
D7
JUPEBChemistryOrganic Chemistry: Hydrocarbons
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Why the answer is C, and why the others tempt you.
C$_3$H$_8$ + 5O$_2$ → 3CO$_2$ + 4H$_2$O. Three carbons need 3 O$_2$ for CO$_2$ and eight hydrogens need 2 O$_2$ for 4H$_2$O, a total of 5. The values 3 and 4 are the moles of CO$_2$ and H$_2$O formed.
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