Question detail
In the equilibrium reaction 2SO2(g) + O2(g) ⇌ 2SO3(g), how many gaseous molecules are present on the reactant side?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Reversible reactions and dynamic equilibrium
Question
- A. 2
- B. 3
- C. 4
- D. 5
Answer
3
Explanation
The correct answer is 3. This answer directly addresses the question: In the equilibrium reaction 2SO2(g) + O2(g) ⇌ 2SO3(g), how many gaseous molecules are present on the reactant side? It matches the approved Chemistry 8462 learning objective and the linked subtopic. The other options are incorrect because they either change the rate, catalyst, reversible reaction, equilibrium, or graph context, or they do not answer the exact point being tested.
Common mistake
Counting Gaseous Molecules Incorrectly
Students often miscount the number of gaseous molecules on one side of the equilibrium equation, leading to incorrect predictions about the effect of pressure changes.
Carefully identify and count only the gaseous molecules on each side of the equation, ensuring to exclude any solids or liquids.
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