IOE Engineering Entrance Examination (Tribhuvan University, Nepal) · Chemistry

Calculations in chemistry

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

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All 31 questions

  1. 1 mol of a solute is dissolved to make 2 litres of solution. What is the molarity?
  2. 50 mL of 6 M acid is diluted with water to 1000 mL. What is the new molarity?
  3. What is the pH of a strong base solution whose hydroxide ion concentration is 10⁻¹ mol/L at 25 °C?
  4. What volume does 0.25 mol of an ideal gas occupy at STP? (molar volume 22.4 L/mol)
  5. How many grams of water form when 10 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 9.125 g of HCl? (molar mass 36.5 g/mol)
  8. 0.1 mol of a solute is dissolved to make 1 litre of solution. What is the molarity?
  9. 100 mL of 4 M acid is diluted with water to 500 mL. What is the new molarity?
  10. What is the pH of a strong base solution whose hydroxide ion concentration is 10⁻² mol/L at 25 °C?
  11. What volume does 2 mol of an ideal gas occupy at STP? (molar volume 22.4 L/mol)
  12. How many grams of water form when 4 g of hydrogen burns completely in oxygen? (; H = 1, O = 16)
  13. What is the percentage by mass of copper in CuO? (molar mass of CuO = 80, mass of copper in it = 64)
  14. How many moles are there in 73 g of HCl? (molar mass 36.5 g/mol)
  15. 2 mol of a solute is dissolved to make 2 litres of solution. What is the molarity?
  16. 50 mL of 10 M acid is diluted with water to 250 mL. What is the new molarity?
  17. What is the pH of a strong acid solution whose hydrogen ion concentration is 10⁻¹ mol/L?
  18. What volume does 0.5 mol of an ideal gas occupy at STP? (molar volume 22.4 L/mol)
  19. How many grams of water form when 16 g of hydrogen burns completely in oxygen? (; H = 1, O = 16)
  20. How many moles are there in 294 g of H2SO4? (molar mass 98 g/mol)
  21. 1 mol of a solute is dissolved to make 0.5 litres of solution. What is the molarity?
  22. 200 mL of 6 M acid is diluted with water to 400 mL. What is the new molarity?
  23. What volume does 1.5 mol of an ideal gas occupy at STP? (molar volume 22.4 L/mol)
  24. How many moles are there in 168 g of KOH? (molar mass 56 g/mol)
  25. 2 mol of a solute is dissolved to make 4 litres of solution. What is the molarity?
  26. 200 mL of 10 M acid is diluted with water to 1000 mL. What is the new molarity?
  27. What is the pH of a strong acid solution whose hydrogen ion concentration is 10⁻⁵ mol/L?
  28. How many grams of water form when 8 g of hydrogen burns completely in oxygen? (; H = 1, O = 16)
  29. What is the percentage by mass of magnesium in MgO? (molar mass of MgO = 40, mass of magnesium in it = 24)
  30. How many moles are there in 220 g of CO2? (molar mass 44 g/mol)
  31. 0.25 mol of a solute is dissolved to make 4 litres of solution. What is the molarity?

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