General Secondary Certificate (Tawjihiya Kuwait) · Physics and Chemistry

Mole Calculations

35 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 35 questions

  1. Find the relative formula mass of NH. (H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl = 35.5, K = 39, Ca = 40, Fe = 56, Cu = 63.5, Zn = 65, Ag = 108)
  2. Find the relative formula mass of MgCl. (H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl = 35.5, K = 39, Ca = 40, Fe = 56, Cu = 63.5, Zn = 65, Ag = 108)
  3. Find the relative formula mass of CuSO. (H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl = 35.5, K = 39, Ca = 40, Fe = 56, Cu = 63.5, Zn = 65, Ag = 108)
  4. Find the relative formula mass of Ca(NO). (H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl = 35.5, K = 39, Ca = 40, Fe = 56, Cu = 63.5, Zn = 65, Ag = 108)
  5. Find the relative formula mass of Fe(OH). (H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl = 35.5, K = 39, Ca = 40, Fe = 56, Cu = 63.5, Zn = 65, Ag = 108)
  6. Find the relative formula mass of AgNO. (H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl = 35.5, K = 39, Ca = 40, Fe = 56, Cu = 63.5, Zn = 65, Ag = 108)
  7. Find the relative formula mass of CO. (H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl = 35.5, K = 39, Ca = 40, Fe = 56, Cu = 63.5, Zn = 65, Ag = 108)
  8. Find the relative formula mass of CaCO. (H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl = 35.5, K = 39, Ca = 40, Fe = 56, Cu = 63.5, Zn = 65, Ag = 108)
  9. What is the mass of 2 mol of CuSO? (Relative formula mass = 159.5)
  10. What is the mass of 0.2 mol of CaCO? (Relative formula mass = 100)
  11. How many moles are present in 196 g of HSO? (Relative formula mass = 98)
  12. How many moles are present in 31.9 g of CuSO? (Relative formula mass = 159.5)
  13. How many moles are present in 24.5 g of HSO? (Relative formula mass = 98)
  14. How many moles are present in 14.5 g of Mg(OH)? (Relative formula mass = 58)
  15. How many moles are present in 11.6 g of Mg(OH)? (Relative formula mass = 58)
  16. How many moles are present in 212 g of NaCO? (Relative formula mass = 106)
  17. Calculate the percentage by mass of N in (NH)SO. (H = 1, C = 12, N = 14, O = 16, Mg = 24, S = 32, Cl = 35.5, Al = 27, Ca = 40, Fe = 56, Cu = 63.5, Na = 23)
  18. Calculate the percentage by mass of O in CaCO. (H = 1, C = 12, N = 14, O = 16, Mg = 24, S = 32, Cl = 35.5, Al = 27, Ca = 40, Fe = 56, Cu = 63.5, Na = 23)
  19. Calculate the percentage by mass of O in (NH)SO. (H = 1, C = 12, N = 14, O = 16, Mg = 24, S = 32, Cl = 35.5, Al = 27, Ca = 40, Fe = 56, Cu = 63.5, Na = 23)
  20. Calculate the percentage by mass of H in Ca(OH). (H = 1, C = 12, N = 14, O = 16, Mg = 24, S = 32, Cl = 35.5, Al = 27, Ca = 40, Fe = 56, Cu = 63.5, Na = 23)
  21. Calculate the percentage by mass of H in NHCl. (H = 1, C = 12, N = 14, O = 16, Mg = 24, S = 32, Cl = 35.5, Al = 27, Ca = 40, Fe = 56, Cu = 63.5, Na = 23)
  22. 25 cm of 10 mol/dm hydrochloric acid is diluted with water to a total volume of 1000 cm. What is the new concentration?
  23. 50 cm of 6 mol/dm hydrochloric acid is diluted with water to a total volume of 500 cm. What is the new concentration?
  24. 10 cm of 0.5 mol/dm hydrochloric acid is diluted with water to a total volume of 1000 cm. What is the new concentration?
  25. 10 cm of 10 mol/dm hydrochloric acid is diluted with water to a total volume of 250 cm. What is the new concentration?
  26. 50 cm of 2 mol/dm hydrochloric acid is diluted with water to a total volume of 200 cm. What is the new concentration?
  27. What is the volume of 1.5 mol of any gas at room temperature and pressure? (Molar volume = 24 dm/mol at r.t.p.)
  28. 6 g of magnesium reacts completely according to 2Mg + O → 2MgO. What mass of magnesium oxide is formed? (Relative masses: magnesium 24, magnesium oxide 40.)
  29. 50 g of calcium carbonate reacts completely according to CaCO → CaO + CO. What mass of calcium oxide is formed? (Relative masses: calcium carbonate 100, calcium oxide 56.)
  30. 200 g of calcium carbonate reacts completely according to CaCO → CaO + CO. What mass of calcium oxide is formed? (Relative masses: calcium carbonate 100, calcium oxide 56.)
  31. 12 g of magnesium reacts completely according to 2Mg + O → 2MgO. What mass of magnesium oxide is formed? (Relative masses: magnesium 24, magnesium oxide 40.)
  32. A compound contains 224 g of Fe and 96 g of O. What is its empirical formula? (Fe = 56, O = 16)
  33. A compound contains 54 g of Al and 48 g of O. What is its empirical formula? (Al = 27, O = 16)
  34. A compound contains 184 g of Na and 128 g of S. What is its empirical formula? (Na = 23, S = 32)
  35. A compound contains 24 g of C and 4 g of H. What is its empirical formula? (C = 12, H = 1)

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