GAMSAT (Graduate Medical School Admissions Test) · Reasoning in Biological and Physical Sciences

Chemistry calculations

20 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 20 questions

  1. 0.1 mol of a solute is dissolved to make 1 litres of solution. What is the molarity?
  2. 100 mL of 4 M acid is diluted with water to 500 mL. What is the new molarity?
  3. What is the pH of a strong acid solution whose hydrogen ion concentration is 10⁻³ mol/L?
  4. What volume does 3 mol of an ideal gas occupy at STP? (molar volume 22.4 L/mol)
  5. How many grams of water form when 8 g of hydrogen burns completely in oxygen? (; H = 1, O = 16)
  6. What is the percentage by mass of sulphur in SO2? (molar mass of SO2 = 64, mass of sulphur in it = 32)
  7. How many moles are there in 300 g of CaCO3? (molar mass 100 g/mol)
  8. 0.1 mol of a solute is dissolved to make 0.5 litres of solution. What is the molarity?
  9. What is the pH of a strong base solution whose hydroxide ion concentration is 10⁻¹ mol/L at 25 °C?
  10. What volume does 0.5 mol of an ideal gas occupy at STP? (molar volume 22.4 L/mol)
  11. How many grams of water form when 20 g of hydrogen burns completely in oxygen? (; H = 1, O = 16)
  12. What is the percentage by mass of magnesium in MgO? (molar mass of MgO = 40, mass of magnesium in it = 24)
  13. How many moles are there in 20 g of NaOH? (molar mass 40 g/mol)
  14. 0.5 mol of a solute is dissolved to make 2 litres of solution. What is the molarity?
  15. 100 mL of 6 M acid is diluted with water to 400 mL. What is the new molarity?
  16. What is the pH of a strong base solution whose hydroxide ion concentration is 10⁻³ mol/L at 25 °C?
  17. What volume does 2 mol of an ideal gas occupy at STP? (molar volume 22.4 L/mol)
  18. How many grams of water form when 10 g of hydrogen burns completely in oxygen? (; H = 1, O = 16)
  19. What is the percentage by mass of copper in CuO? (molar mass of CuO = 80, mass of copper in it = 64)
  20. How many moles are there in 51 g of NH3? (molar mass 17 g/mol)

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