Question: When the equation - C 2 H 6 + O 2 - C O 2 + ? - - H 2 O is correctly balanced,

When the equation
-C2H6+O2-CO2+?--H2O
is correctly balanced, the coefficient in front of O2 will be
(1)7
(3)3
(2)10
(4)4
When the equation -C2H6+O2-CO2+?--H2O is correctly balanced, the coefficient in front

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