Some Basic Concepts – Stoichiometry, Percentage Composition, Empirical/Molecular Formula

Grade 11 Chemistry — Some Basic Concepts – Stoichiometry, Percentage Composition, Empirical/Molecular Formula: 25 practice questions with instant scoring and explanations.

1. Stoichiometry deals with:
2. The percentage composition of C in CO₂ is:
3. In the reaction 2H₂ + O₂ → 2H₂O, the ratio H₂:O₂ is:
4. Percentage of O in H₂SO₄ is:
5. If C:H:O = 1:2:1, the empirical formula is:
6. Molecular formula is always a:
7. In C + O₂ → CO₂, 12g C reacts with:
8. Empirical formula mass comes from:
9. Compound with 40% C, 6.7% H has empirical formula:
10. If empirical mass = 30 and molecular mass = 180, n =:
11. In 4g H₂ + 32g O₂ reaction, limiting reagent is:
12. Percentage of N in NH₃ (M=17):
13. Relationship between formulas:
14. 23g Na reacts with Cl₂ to give:
15. Compound 75% C, 25% H, M=16, empirical formula:
16. Percentage composition from:
17. Limiting reagent is:
18. 8g CH₄ produces H₂O (M=18):
19. C:H:O = 2:4:1 gives empirical:
20. 85.7% C gives empirical formula:
21. N₂ + 3H₂ → 2NH₃, mass ratio N₂:H₂:
22. Percentage S in H₂SO₄:
23. C₆H₁₂O₆ empirical formula:
24. Mole ratio from balanced equation:
25. To find empirical formula need: