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If a questions asks for the coefficient of O2, is it 13/2 or 13 after balancing the cumbustion of butane?
C4H10 + (13/2) O2 --> 4 CO2 + 5 H2O
or
2 C4H10 + 13 O2 -->8 CO2+10 H2O
C4H10 + (13/2) O2 --> 4 CO2 + 5 H2O
or
2 C4H10 + 13 O2 -->8 CO2+10 H2O