What is the sum of the coefficients in the balanced equation for the complete combustion of 2-methylbutane? Use smallest whole number coefficients. Do not forget coefficients of 1.

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Solution

The correct option is D 20
2-methylbutane can be written as $C H_{3} - C H (C H_{3}) - C H_{2} - C H_{3}$ , that is, it can also be written as $C_{5} H_{12}$ . The complete combustion of 2-methylbutane can be written as-
$C_{5} H_{12}$ $+$ $8 O_{2}$ $=$ $5 C O_{2}$ $+$ $6 H_{2} O$
Thus, the sum of the co-efficients in the balanced equation is $(1 + 8 + 5 + 6)$ , that is $20$ .
Option D is the correct answer.

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