O Level · Chemistry
35+ O Level Chemistry Mole concept Practice Questions for 2026 (based on Singapore MOE Syllabus)
The mole concept links mass, number of moles, molar mass and volume of gas at rtp. This page has 35+ O Level mole concept and stoichiometry questions with full worked solutions for Singapore Pure Chemistry students.
35 free sample questions below — answers and step-by-step solutions included.
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These 35 questions are a sample. On Tutorly.sg/app you can practise unlimited O Level Chemistry questions, get instant explanations after you try, and use past-year papers — no sign-up needed to start.
- ✓ Unlimited practice questions (not just 10)
- ✓ Step-by-step working when you are stuck
- ✓ Singapore syllabus: O Level
Opens tutorly.sg/app — same subject ready for you.
- Question 1easy
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- Question 3medium
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- Question 8medium
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- Question 13medium
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- Question 18medium
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- Question 21easy
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- Question 23medium
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- Question 26easy
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- Question 28medium
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- Question 31easy
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- Question 33medium
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- Question 35hard
Frequently asked questions
- What is the mole concept in O Level Chemistry?
- One mole contains 6.02 × 10²³ particles. You use molar mass (g/mol) to convert between mass and moles, and molar gas volume at rtp (24 dm³/mol) to convert between moles and gas volume.
- How do I calculate number of moles?
- Moles = mass ÷ molar mass. For gases at room temperature and pressure: moles = volume (dm³) ÷ 24. Always write the formula, substitute values with units, then calculate.
- What are common O Level mole concept mistakes?
- Students confuse mass with moles, use the wrong molar mass, forget to balance equations before mole ratios, or mix up dm³ with cm³. Show all working — method marks are awarded in Singapore papers.
- Is this aligned to the Singapore O Level Chemistry syllabus?
- Yes. Questions cover molar mass, mole calculations, reacting masses, gas volumes at rtp, and stoichiometry — all tested in Singapore O Level Pure Chemistry.
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Free on Tutorly.sg
Want more Mole concept questions — with step-by-step help?
These 35 questions are a sample. On Tutorly.sg/app you can practise unlimited O Level Chemistry questions, get instant explanations after you try, and use past-year papers — no sign-up needed to start.
- ✓ Unlimited practice questions (not just 10)
- ✓ Step-by-step working when you are stuck
- ✓ Singapore syllabus: O Level
Opens tutorly.sg/app — same subject ready for you.
Study this topic in depth
Notes, worked examples, common mistakes, and exam tips for Mole concept.
O Level Chemistry — Mole Concept hub →