10
QuizMultiple Choice

Chemical Reactions — Test

Question 10 • Chemistry

Consider the chemical equation for the combustion of sugar. _ cap c sub 6 cap h sub 12 cap o sub 6 s plus _ cap o sub 2 g ce bond right arrow _ CO sub 2 g plus _ cap h sub 2 cap o l Which sequence of coefficients should be placed in the blanks to balance this equation?

Answer
A
1 , 6 , 6 , 6
B
6 , 1 , 6 , 1
C
3 , 3 , 3 , 6
D
1 , 3 , 3 , 6

Explanation

Start with 1 C₆H₁₂O₆. Its 6 carbon atoms require 6 CO₂, and its 12 hydrogen atoms require 6 H₂O. Those products contain 18 oxygen atoms total; the sugar provides 6, so the remaining 12 oxygen atoms require 6 O₂. The coefficients are 1, 6, 6, 6, which is choice B.

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