Tahsili SAAT (Saudi Arabia) · Chemistry

Moles, gases and solutions

29 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 29 questions

  1. How many moles are in 500 g of CaCO₃? (Molar mass 100 g/mol)
  2. How many moles are in 80 g of MgO? (Molar mass 40 g/mol)
  3. How many moles are in 200 g of NaOH? (Molar mass 40 g/mol)
  4. How many moles are in 24 g of CH₄? (Molar mass 16 g/mol)
  5. How many moles are in 18.25 g of HCl? (Molar mass 36.5 g/mol)
  6. How many moles are in 150 g of CaCO₃? (Molar mass 100 g/mol)
  7. 25 g of CaCO₃ (molar mass 100 g/mol) is dissolved to make 2000 mL of solution. What is the concentration?
  8. 40 g of NaOH (molar mass 40 g/mol) is dissolved to make 500 mL of solution. What is the concentration?
  9. 40 g of NaOH (molar mass 40 g/mol) is dissolved to make 2000 mL of solution. What is the concentration?
  10. 20 g of NaOH (molar mass 40 g/mol) is dissolved to make 250 mL of solution. What is the concentration?
  11. 9 g of H₂O (molar mass 18 g/mol) is dissolved to make 1000 mL of solution. What is the concentration?
  12. 25 g of CaCO₃ (molar mass 100 g/mol) is dissolved to make 500 mL of solution. What is the concentration?
  13. How much 4 mol/L acid is needed to prepare 200 mL of 1 mol/L acid by dilution?
  14. How much 6 mol/L acid is needed to prepare 500 mL of 0.25 mol/L acid by dilution?
  15. How much 10 mol/L acid is needed to prepare 400 mL of 0.25 mol/L acid by dilution?
  16. How much 12 mol/L acid is needed to prepare 500 mL of 0.25 mol/L acid by dilution?
  17. What volume do 5 mol of an ideal gas occupy at STP? (molar volume 22.4 L)
  18. What volume do 2 mol of an ideal gas occupy at STP? (molar volume 22.4 L)
  19. What volume do 3 mol of an ideal gas occupy at STP? (molar volume 22.4 L)
  20. What volume do 0.5 mol of an ideal gas occupy at STP? (molar volume 22.4 L)
  21. What is the pH of a 10^-6 mol/L solution of a strong base like NaOH at 25 degrees Celsius?
  22. What is the pH of a 10^-1 mol/L solution of a strong base like NaOH at 25 degrees Celsius?
  23. What is the pH of a 10^-2 mol/L solution of a strong monoprotic acid?
  24. What is the pH of a 10^-3 mol/L solution of a strong base like NaOH at 25 degrees Celsius?
  25. What is the pH of a 10^-4 mol/L solution of a strong base like NaOH at 25 degrees Celsius?
  26. What is the pH of a 10^-5 mol/L solution of a strong base like NaOH at 25 degrees Celsius?
  27. 2H₂ + O₂ → 2H₂O. How many grams of water form from 10 g of hydrogen? (H = 1, O = 16)
  28. 2H₂ + O₂ → 2H₂O. How many grams of water form from 6 g of hydrogen? (H = 1, O = 16)
  29. 2H₂ + O₂ → 2H₂O. How many grams of water form from 8 g of hydrogen? (H = 1, O = 16)

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