Medical Entrance Exam (University of Iceland) · Chemistry

Chemical calculations

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

Practise Chemical calculations now

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

All 28 questions

  1. 2 mol of a solute is dissolved to make 0.25 litres of solution. What is the molarity?
  2. What is the pH of a strong base solution whose hydroxide ion concentration is 10⁻¹ mol/L at 25 °C?
  3. What volume does 1.5 mol of an ideal gas occupy at STP? (molar volume 22.4 L/mol)
  4. How many grams of water form when 4 g of hydrogen burns completely in oxygen? (; H = 1, O = 16)
  5. What is the percentage by mass of magnesium in MgO? (molar mass of MgO = 40, mass of magnesium in it = 24)
  6. How many moles are there in 224 g of KOH? (molar mass 56 g/mol)
  7. 0.5 mol of a solute is dissolved to make 1 litres of solution. What is the molarity?
  8. 200 mL of 6 M acid is diluted with water to 1000 mL. What is the new molarity?
  9. What is the pH of a strong acid solution whose hydrogen ion concentration is 10⁻⁵ mol/L?
  10. What volume does 2 mol of an ideal gas occupy at STP? (molar volume 22.4 L/mol)
  11. How many grams of water form when 40 g of hydrogen burns completely in oxygen? (; H = 1, O = 16)
  12. How many moles are there in 11 g of CO2? (molar mass 44 g/mol)
  13. 0.2 mol of a solute is dissolved to make 1 litres of solution. What is the molarity?
  14. 100 mL of 6 M acid is diluted with water to 1000 mL. What is the new molarity?
  15. What is the pH of a strong base solution whose hydroxide ion concentration is 10⁻³ mol/L at 25 °C?
  16. What volume does 3 mol of an ideal gas occupy at STP? (molar volume 22.4 L/mol)
  17. How many grams of water form when 16 g of hydrogen burns completely in oxygen? (; H = 1, O = 16)
  18. What is the percentage by mass of sodium in NaOH? (molar mass of NaOH = 40, mass of sodium in it = 23)
  19. How many moles are there in 182.5 g of HCl? (molar mass 36.5 g/mol)
  20. 0.1 mol of a solute is dissolved to make 1 litres of solution. What is the molarity?
  21. 200 mL of 10 M acid is diluted with water to 1000 mL. What is the new molarity?
  22. What is the pH of a strong acid solution whose hydrogen ion concentration is 10⁻¹ mol/L?
  23. What volume does 0.5 mol of an ideal gas occupy at STP? (molar volume 22.4 L/mol)
  24. How many grams of water form when 10 g of hydrogen burns completely in oxygen? (; H = 1, O = 16)
  25. What is the percentage by mass of calcium in CaCO3? (molar mass of CaCO3 = 100, mass of calcium in it = 40)
  26. 100 mL of 10 M acid is diluted with water to 1000 mL. What is the new molarity?
  27. How many moles are there in 25 g of CaCO3? (molar mass 100 g/mol)
  28. What is the percentage by mass of sulphur in SO2? (molar mass of SO2 = 64, mass of sulphur in it = 32)

Keep practising

More Medical Entrance Exam (University of Iceland) topics

All Medical Entrance Exam (University of Iceland) practice →

Chemical calculations in other exams

Ready for the full Medical Entrance Exam (University of Iceland) test?

Take a mock testMedical Entrance Exam (University of Iceland) hub