Atomic Weights - Disk #4


  1. _____ How many carbon atoms are in one molecule of methane (CH4)?
  2. _____ How many hydrogen atoms are in one molecule of methane?
  3. _____ A calcium ion, Ca++, has a charge of +2. Will a crystal of calcium chloride have equal numbers of Ca++ and Cl- ions?
  4. _____ How many nitrate ions are there for each calcium ion, Ca++, in calcium nitrate?
  5. _____ How many calcium atoms are there in one formula unit of Ca(ClO4)2?
  6. _____ How many chlorine atoms are there in one formula unit of calcium perchlorate?
  7. _____ How many oxygen atoms are there in one formula unit of calcium perchlorate?
  8. _____ How many hydrogen atoms are there in one formula unit of CuSO4 5H2O?
  9. _____ How many oxygen atoms are there in one formula unit of copper sulfate shown above?
  10. _____ How many grams of oxygen are in the 18 grams of water which is formed in the following reaction?

2H2 + O2 2H2O

11. _____ How many grams of oxygen are in 44 grams of CO2?

C + O2 CO2

12. _____ How many grams of carbon are in 44 grams of carbon dioxide?

13. _____ What is the atomic number of helium?

14. _____ What is the atomic number of boron?

15. _____ What is the atomic number of neon?

16. _____ What is the atomic weight of carbon?

17. _____ What is the atomic number of beryllium?

18. _____ What is the atomic number of hydrogen?

19. _____ What is the atomic weight of oxygen?

20. _____ What is the atomic weight of nitrogen?

21. _____ What is the formula weight of CO?

22. _____ What is the formula weight of CO2?

23. _____ What is the molecular weight of NH3?

24. _____ How many Ca atoms are in the formula - CaCl2 . 2H2O?

25. _____ How many Cl atoms are in the formula for hydrated calcium chloride?

26. _____ How many H atoms are in the formula above?

27. _____ How many O atoms are in the formula above?

28. _____ What is the formula weight of CaCl2 . 2H2O?

29. _____ What is the molecular weight of NH3?

30. _____ What is the formula weight of Li2S?

31. _____ What is the m.w. of P2O5?

32. _____ What is the f.w. of Al2O3?

33. _____ What is the f.w. of NaNO3?

34. _____ What is the formula weight of the salt MgSO4 . 7H2O?

35. _____ What is the f.w. of Na3PO4?

36. _____ What is the f.w. of CuSO4 . 5H2O?

37. _____ Which weighs more an atom of hydrogen or an atom of carbon?

38. _____ Suppose you had 4 grams of helium. If you wanted the same number of carbon atoms as helium atoms, how many grams of carbon would you need?

39. _____ What is the gram atomic weight of oxygen?

40. _____ What is the gram atomic weight of helium?

41. _____ What is the weight, in grams, of 6.023 X 1023 atoms of Cu?

42. _____ What is the weight, in grams, of one mole of carbon?

43. _____ What is the weight, in grams, of two moles of C?

44. _____ What is the gram molecular weight of H2O?

45. _____ How many grams of water, H2O, do you need to have 6.023 X 1023 oxygen atoms?

46. _____ What is the gram formula weight of NaCl?

47. _____ If a beaker contains 6.023 X 1023 molecules of water, how many moles of water are in it?

48. _____ What is the weight, in grams, of 5 moles of H2O?

49. _____ What is the weight, in grams, of 3 moles of copper?

50. _____ How many moles of CaCl2 would you need to supply 1 mole of Cl atoms?


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