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Question

When the equation: C2H6+O2CO2+H2O is completely balanced using the lowest whole number coefficients, the sum of the coefficients will be :

A
4
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B
9.5
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C
19
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D
15.5
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E
11
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Solution

The correct option is C 19
The unbalanced equation is
C2H6+O2CO2+H2O
Balance C atoms
C2H6+O22CO2+H2O
Balance H atoms
C2H6+O22CO2+3H2O
Balance O atoms
C2H6+72O22CO2+3H2O
Multiply the above equation with 2 to get whole number coefficients.
2C2H6+7O24CO2+6H2O
This is the balanced equation.
The sum of the coefficients will be 2+7+4+6=19.

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