PU E 2026 Basic Concepts Free Quiz 3

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PU E 2026 Basic Concepts Free Quiz 3

PU E Quiz

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General

General 10 MCQs

21. How many particles are in one mole?

A. 6.022 × 10²³ B. 6.022 × 10²² C. 6.022 × 10²⁴ D. 6.022 × 10²⁵

22. What is Avogadro's number?

A. 6.022 × 10²² B. 6.022 × 10²³ C. 6.022 × 10²⁴ D. 6.022 × 10²⁵

23. What is the molar mass of carbon-12?

A. 1 g/mol B. 6 g/mol C. 12 g/mol D. 24 g/mol

24. How many moles are in 24 g of carbon? (Molar mass of C = 12 g/mol)

A. 0.5 mol B. 1 mol C. 3 mol D. 2 mol

25. What is the mass of 2 moles of water? (H₂O molar mass = 18 g/mol)

A. 36 g B. 18 g C. 54 g D. 72 g

26. What is an empirical formula?

A. Simplest whole-number ratio of atoms B. Actual number of atoms in a molecule C. Arrangement of atoms in a molecule D. Formula showing all bonds

27. What is a molecular formula?

A. Simplest whole-number ratio of atoms B. Actual number of atoms in a molecule C. Arrangement of atoms in a molecule D. Formula showing all bonds

28. What is the empirical formula of glucose (C₆H₁₂O₆)?

A. C₆H₁₂O₆ B. C₂H₄O₂ C. CH₂O D. C₃H₆O₃

29. A compound has empirical formula CH₂O and molar mass 180 g/mol. What is its molecular formula?

A. CH₂O B. C₂H₄O₂ C. C₃H₆O₃ D. C₆H₁₂O₆

30. What is the molar mass of CH₂O? (C=12, H=1, O=16)

A. 30 g/mol B. 40 g/mol C. 50 g/mol D. 60 g/mol

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