2. Percent Composition Molar Mass Molar Conversions Empirical Formulas Random 10 20 30 40 50

3. Percent Composition- 10 What is the Percent by mass of carbon in carbon monoxide (CO)?

4. Answer 1 – 10 48.88% Carbon

5. Percent Composition - 20 What is the percent by mass of Nitrogen (N) in NH 3 ?

6. Answer 1 – 20 82.21% Nitrogen

7. Percent Composition - 30 A 63.00 g sample of KNO 3 contains 24.36 g of Potassium (K). What is the percent by mass of the potassium in this compound?

8. Answer 1 – 30 38.67% Potassium

9. Percent Composition - 40 What is the percent composition of CH 3 Cl? (Include all parts)

10. Answer 1 – 40 23.79% Carbon 6.00% Hydrogen 70.21% Chlorine

11. Percent Composition - 50 What is the percent by mass of sulfur (S) in Al 2 (SO 4 ) 3 ?

12. Answer 1 – 50 28.12% Sulfur

13. Molar Mass - 10 What is the molar mass of Phosphorus (P)?

14. Answer 2 – 10 30.97 g/mol P

15. Molar Mass - 20 What is the molar mass of sodium hydroxide (NaOH)?

16. Answer 2 – 20 40.00 g/mol NaOH

17. Molar Mass - 30 What is the Molar Mass of Copper (II) Bromide? CuBr 2

18. Answer 2 – 30 223.35 g/mol CuBr 2

19. Molar Mass - 40 Calculate the Molar Mass of C 2 H 5 OH.

20. Answer 2 – 40 46.08 g/mol C 2 H 5 OH

21. Molar Mass - 50 Find the molar mass of (NH 4 ) 3 PO 4

22. Answer 2 – 50 149.12 g/mol (NH 4 ) 3 PO 4

23. Molar Conversions - 10 How many atoms are in 3.548 moles of Boron (B)?

24. Answer 3 – 10 2.155 x 10 24 atoms B

25. Molar Conversions- 20 How many moles are in a 270 g sample of HCl?

26. Answer 3 – 20 7.4 mol HCl

27. Molar Conversions- 30 How many molecules are there in 100. g of water?

28. Answer 3 – 30 3.34 x 10 24 molecules H 2 O

29. Molar Conversions - 40 2.33 x 10 21 atoms of Cobalt (Co) is how many grams?

30. Answer 3 – 40 0.228 g Co

31. Molar Conversions - 50 What mass of Titanium (Ti) metal contains the same number of atoms in 78.90 grams of Lead (Pb)?

32. Answer 3 – 50 18.23 g Ti

33. Empirical Formula - 10 Find the empirical formula of a compound that contains 2.64 g of Nitrogen (N), and 3.01 g of Oxygen(O).

34. Answer 4 – 10 NO

35. Question 4 - 20 A compound contains potassium (K) and sulfur (S). For every 38.91 g of potassium, there are 15.98 g of sulfur. What is the empirical formula of this compound?

36. Answer 4 – 20 K 2 S

37. Empirical Formulas- 30 What is the empirical formula of a compound containing 25.00 g of bromine (Br), 11.27 g of carbon (C), and 2.21 g of Hydrogen (H)?

38. Answer 4 – 30 C 3 H 7 Br

39. Empirical Formulas - 40 Find the empirical formula for a compound containing 15.95 g of calcium (Ca), and 9.55 g of oxygen (O).

40. Answer 4 – 40 Ca 2 O 3

41. Empirical Formula - 50 In an experiment similar to the zinc chloride experiment, a student placed a piece of aluminum in hydrochloric acid. Hydrogen gas was given off, and then the liquid was evaporated off. The remaining solid, aluminum chloride was massed. Use the data below to determine the empirical formula of aluminum chloride. Mass of beaker195.22 g Mass of aluminum and beaker before reaction 197.73 g Mass of aluminum chloride and beaker after reaction 207.62 g

42. Answer 4 – 50 AlCl 3

43. Random - 10 What is Avogadro’s Number (a mole)?

44. Answer 5 – 10 6.02 x 10 23

45. Random - 20 How many sulfur atoms are represented by the formula Pb(SO 4 ) 2 ?

46. Answer 5 – 20 2 sulfur atoms

47. Random - 30 If a paper clip weighs 1.12 g, a binder clip weighs 3.47 g, and a staple weighs 0.32 g, what is the relative mass of a paper clip?

48. Answer 5 – 30 3.5

49. Random - 40 What is the empirical and molecular formula of the following compound?

50. Answer 5 – 40 Empirical formula: C 2 H 5 Molecular formula: C 4 H 10

51. Random - 50 What T.V. show do Cesium and Iodine love watching together?

52. Answer 5 – 50 CsI