MDCAT Pakistan · Chemistry

Physical Chemistry: Moles, Solutions and Stoichiometry

32 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 32 questions

  1. How many moles are there in 300 g of CaCO₃? (molar mass 100 g/mol)
  2. What is the mass of 1.5 mol of MgCl₂? (molar mass 95 g/mol)
  3. What is the pH of 10⁻4 mol/dm³ hydrochloric acid (a strong monobasic acid)?
  4. For the reaction N₂ + 3H₂ → 2NH₃, what mass of NH₃ forms from 14 g of N₂? (molar masses: N₂ = 28, NH₃ = 17 g/mol)
  5. What is the oxidation number of S in SO₂?
  6. What is the percentage by mass of Ca in CaCO₃?
  7. How many neutrons are in an atom of Al-27 (atomic number 13)?
  8. What is the electronic configuration (shell by shell) of the element Al (atomic number 13)?
  9. What is the mass of 5 mol of CaO? (molar mass 56 g/mol)
  10. 0.25 mol of solute is dissolved to make 2 dm³ of solution. What is the molarity?
  11. What is the pH of 10⁻1 mol/dm³ hydrochloric acid (a strong monobasic acid)?
  12. What volume does 2 mol of N₂ gas occupy at STP? (molar volume 22.4 dm³/mol)
  13. What is the oxidation number of Cr in K₂Cr₂O₇?
  14. What is the electronic configuration (shell by shell) of the element Cl (atomic number 17)?
  15. How many moles are there in 280 g of KOH? (molar mass 56 g/mol)
  16. What is the mass of 0.25 mol of MgCl₂? (molar mass 95 g/mol)
  17. What is the pH of 10⁻3 mol/dm³ sodium hydroxide at 25 °C?
  18. What volume does 3 mol of O₂ gas occupy at STP? (molar volume 22.4 dm³/mol)
  19. What is the electronic configuration (shell by shell) of the element C (atomic number 6)?
  20. What is the molar mass of NaCl? (H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl = 35.5, K = 39, Ca = 40, Mn = 55, Fe = 56)
  21. What is the mass of 0.5 mol of HNO₃? (molar mass 63 g/mol)
  22. 0.25 mol of solute is dissolved to make 0.5 dm³ of solution. What is the molarity?
  23. What is the pH of 10⁻4 mol/dm³ sodium hydroxide at 25 °C?
  24. What is the molar mass of Fe₂O₃? (H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl = 35.5, K = 39, Ca = 40, Mn = 55, Fe = 56)
  25. How many moles are there in 16 g of SO₂? (molar mass 64 g/mol)
  26. What is the mass of 1.5 mol of NaCl? (molar mass 58.5 g/mol)
  27. What volume does 0.5 mol of O₂ gas occupy at STP? (molar volume 22.4 dm³/mol)
  28. What is the oxidation number of N in NH₃?
  29. What is the electronic configuration (shell by shell) of the element K (atomic number 19)?
  30. What is the molar mass of HCl? (H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl = 35.5, K = 39, Ca = 40, Mn = 55, Fe = 56)
  31. How many moles are there in 8 g of CH₄? (molar mass 16 g/mol)
  32. What is the mass of 0.5 mol of Na₂CO₃? (molar mass 106 g/mol)

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