Victorian VCE · VCE Chemistry

Chemical calculations

14 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 14 questions

  1. 0.5 mol of a solute is dissolved to make 0.25 litres of solution. What is the molarity?
  2. 100 mL of 10 M acid is diluted with water to 1000 mL. What is the new molarity?
  3. What is the pH of a strong acid solution whose hydrogen ion concentration is 10⁻¹ mol/L?
  4. What volume does 2 mol of an ideal gas occupy at STP? (molar volume 22.4 L/mol)
  5. How many grams of water form when 16 g of hydrogen burns completely in oxygen? (; H = 1, O = 16)
  6. What is the percentage by mass of sodium in NaOH? (molar mass of NaOH = 40, mass of sodium in it = 23)
  7. How many moles are there in 22 g of CO2? (molar mass 44 g/mol)
  8. 0.25 mol of a solute is dissolved to make 0.25 litres of solution. What is the molarity?
  9. 200 mL of 2 M acid is diluted with water to 1000 mL. What is the new molarity?
  10. What is the pH of a strong acid solution whose hydrogen ion concentration is 10⁻⁴ mol/L?
  11. How many grams of water form when 4 g of hydrogen burns completely in oxygen? (; H = 1, O = 16)
  12. How many moles are there in 50 g of CaCO3? (molar mass 100 g/mol)
  13. 0.2 mol of a solute is dissolved to make 2 litres of solution. What is the molarity?
  14. What volume does 1.5 mol of an ideal gas occupy at STP? (molar volume 22.4 L/mol)

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