- _____ How many carbon atoms are in one molecule of methane (CH
_{4})? - _____ How many hydrogen atoms are in one molecule of methane?
- _____ A calcium ion, Ca
^{++}, has a charge of +2. Will a crystal of calcium chloride have equal numbers of Ca^{++}and Cl^{-}ions? - _____ How many nitrate ions are there for each calcium ion, Ca
^{++}, in calcium nitrate? - _____ How many calcium atoms are there in one formula unit of Ca(ClO
_{4})_{2}? - _____ How many chlorine atoms are there in one formula unit of calcium perchlorate?
- _____ How many oxygen atoms are there in one formula unit of calcium perchlorate?
- _____ How many hydrogen atoms are there in one formula unit of CuSO
_{4}5H_{2}O? - _____ How many oxygen atoms are there in one formula unit of copper sulfate shown above?
- _____ How many grams of oxygen are in the 18 grams of water which is formed in the following reaction?

2H_{2} + O_{2} 2H_{2}O

11. _____ How many grams of oxygen are in 44 grams of CO_{2}?

C + O_{2} CO_{2}

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 CO_{2}?

23. _____ What is the molecular weight of NH_{3}?

24. _____ How many Ca atoms are in the formula - CaCl_{2} . 2H_{2}O?

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 CaCl_{2} . 2H_{2}O?

29. _____ What is the molecular weight of NH_{3}?

30. _____ What is the formula weight of Li_{2}S?

31. _____ What is the m.w. of P_{2}O_{5}?

32. _____ What is the f.w. of Al_{2}O_{3}?

33. _____ What is the f.w. of NaNO_{3}?

34. _____ What is the formula weight of the salt MgSO_{4} . 7H_{2}O?

35. _____ What is the f.w. of Na_{3}PO_{4}?

36. _____ What is the f.w. of CuSO_{4} . 5H_{2}O?

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 10^{23} 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 H_{2}O?

45. _____ How many grams of water, H_{2}O, do you need to have 6.023 X 10^{23}
oxygen atoms?

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

47. _____ If a beaker contains 6.023 X 10^{23} molecules of water, how many
moles of water are in it?

48. _____ What is the weight, in grams, of 5 moles of H_{2}O?

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

50. _____ How many moles of CaCl_{2} would you need to supply 1 mole of Cl
atoms?

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