Mole Concept
Which pair of solutions contains the same number of moles of solute?
Select the correct option:
Solution
100 mL of 0.2 M KCl and 200 mL of 0.1 M KCl
- Formula: Moles=Molarity×Volume (L).
- Analyze each pair:
- Option 3: 100 mL (0.1 L)×0.2 M=0.02 mol. 200 mL (0.2 L)×0.1 M=0.02 mol. Matches.
- Option 1: 0.5×1=0.5 vs 0.25×1=0.25. (No)
- Option 2: 0.05×1=0.05 vs 0.025×1=0.025. (No)
- Option 4: 0.4×0.5=0.2 vs 0.2×0.8=0.16. (No)
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About This Question
- Subject
- chemistry
- Chapter
- some basic concepts in chemistry
- Topic
- mole concept
- Difficulty
- Hard
- Year
- 2025
Solution
Correct Answer:
100 mL of 0.2 M KCl and 200 mL of 0.1 M KCl
- Formula: Moles=Molarity×Volume (L).
- Analyze each pair:
- Option 3: 100 mL (0.1 L)×0.2 M=0.02 mol. 200 mL (0.2 L)×0.1 M=0.02 mol. Matches.
- Option 1: 0.5×1=0.5 vs 0.25×1=0.25. (No)
- Option 2: 0.05×1=0.05 vs 0.025×1=0.025. (No)
- Option 4: 0.4×0.5=0.2 vs 0.2×0.8=0.16. (No)
This hard difficulty chemistry question is from the chapter some basic concepts in chemistry, covering the topic of mole concept. It appeared in the 2025 exam.
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