Wazari Exam (Iraq Baccalaureate) - Scientific Branch · Chemistry

Moles, stoichiometry and solutions

16 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 16 questions

  1. How many moles are there in 22 g of CO₂? (Relative atomic masses: H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl = 35.5, K = 39, Ca = 40, Fe = 56, Zn = 65.)
  2. How many moles are there in 25 g of CaCO₃? (Relative atomic masses: H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl = 35.5, K = 39, Ca = 40, Fe = 56, Zn = 65.)
  3. How many moles are there in 51 g of NH₃? (Relative atomic masses: H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl = 35.5, K = 39, Ca = 40, Fe = 56, Zn = 65.)
  4. How many moles are there in 32 g of CH₄? (Relative atomic masses: H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl = 35.5, K = 39, Ca = 40, Fe = 56, Zn = 65.)
  5. How many moles are there in 90 g of C₆H₁₂O₆? (Relative atomic masses: H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl = 35.5, K = 39, Ca = 40, Fe = 56, Zn = 65.)
  6. How many moles are there in 73 g of HCl? (Relative atomic masses: H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl = 35.5, K = 39, Ca = 40, Fe = 56, Zn = 65.)
  7. For the reaction 2Mg + O₂ → 2MgO, how many grams of MgO form from 96 g of Mg (all other reactants are in excess)? (Relative atomic masses: H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S =…
  8. For the reaction CH₄ + 2O₂ → CO₂ + 2H₂O, how many grams of CO₂ form from 32 g of CH₄ (all other reactants are in excess)? (Relative atomic masses: H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al =…
  9. For N₂ + 3H₂ → 2NH₃, 28 g of N₂ is mixed with 4 g of H₂. What is the maximum mass of NH₃ that can form? (Relative atomic masses: H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl =…
  10. For N₂ + 3H₂ → 2NH₃, 56 g of N₂ is mixed with 6 g of H₂. What is the maximum mass of NH₃ that can form? (Relative atomic masses: H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl =…
  11. For N₂ + 3H₂ → 2NH₃, 28 g of N₂ is mixed with 12 g of H₂. What is the maximum mass of NH₃ that can form? (Relative atomic masses: H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl =…
  12. For N₂ + 3H₂ → 2NH₃, 84 g of N₂ is mixed with 12 g of H₂. What is the maximum mass of NH₃ that can form? (Relative atomic masses: H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl =…
  13. For N₂ + 3H₂ → 2NH₃, 56 g of N₂ is mixed with 16 g of H₂. What is the maximum mass of NH₃ that can form? (Relative atomic masses: H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl =…
  14. For N₂ + 3H₂ → 2NH₃, 56 g of N₂ is mixed with 18 g of H₂. What is the maximum mass of NH₃ that can form? (Relative atomic masses: H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl =…
  15. What volume of 10 mol/L hydrochloric acid must be diluted with water to make 400 mL of 0.5 mol/L solution?
  16. What volume of 18 mol/L hydrochloric acid must be diluted with water to make 150 mL of 3 mol/L solution?

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