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Question

Determine the coefficient for O2 when the following equation is balanced in standard form (smallest whole number integers)?
C4H10(g)+O2(g)CO2(g)+H2O(g)

A
4/3
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B
8
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C
10
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D
13/2
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E
26/2
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Solution

The correct option is D 13/2
Rules for solving or balancing a chemical equation:-
1. Write an unbalanced equation.
2. Assign oxidation number for each atom.
3. Separate out reactions into two half reactions.
4. Balance all other atoms except H and O in each half reaction.
5. Balance the hydrogen by H+ or OH .
6. Balance the oxygen atoms by H2O.
7. Make electron gain equivalent to electron loss in the half reactions by multiplying them with respective numbers.
8. Add and simplify the half reactions together.
9. Check for elements and charges are balanced.

The balanced equation is (with smallest whole number)
2C4H10+13O28CO2+10H2O
If the question is not mentioned about whole number as coefficient of O2 then
C4H10+132O24CO2+5H2O

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