Choose the correct answer for each question.

1. The compound Iron(II) chloride has the formula:
   

   1.   ?    FeCl₂
   2.   ?    Fe₂Cl
   3.   ?    2FeCl
   4.   ?    Fe₂Cl₂

2. The compound potassium sulfide has the formula:
   

   1.   ?    K₂S
   2.   ?    KS₂
   3.   ?    K₂S₃
   4.   ?    K₃S₂

3. The formula of chromium(III) oxide is:

   1.   ?    CrO₂
   2.   ?    Cr₃O
   3.   ?    Cr₂O₃
   4.   ?    Cr₃O₂

4. The formula for aluminum nitride is:
   

   1.   ?    AlN₃
   2.   ?    AlN
   3.   ?    Al₂N₃
   4.   ?    Al₂N

5. The formula for the binary molecular compound phosphorus trichloride is:
   

   1.   ?    P₃Cl
   2.   ?    PCl₄
   3.   ?    PCl₃
   4.   ?    3PCl

6. What is the correct formula for the binary covalent compound phosphorus pentachloride?

   1.   ?    PCl₅
   2.   ?    PCl₄
   3.   ?    P₅Cl
   4.   ?    PCl

7. According to the binary method for naming compounds, the name for N₂O is:
   

   1.   ?    nitrogen monoxide
   2.   ?    dinitrogen monoxide
   3.   ?    nitride oxide
   4.   ?    nitrogen peroxide

8. The binary covalent compound N₂O₄ has the name

   1.   ?    dinitride tetroxide
   2.   ?    dinitrogen tetroxide
   3.   ?    dinitride tetroxygen
   4.   ?    nitrogen tetroxide

9. The formula for the binary molecular compound carbon tetrabromide is:

   1.   ?    CBr₄
   2.   ?    CBr₃
   3.   ?    CBr₅
   4.   ?    C₄Br₄

10. The amount of substance having 6.022 x 10²³ of any kind of chemical unit is called a(n):
    

    1.   ?    atomic weight
    2.   ?    mole
    3.   ?    formula
    4.   ?    mass number

11. The molar mass of sodium oxide, Na₂O is approximately
    

    1.   ?    55 grams
    2.   ?    39 grams
    3.   ?    62 grams
    4.   ?    6.022 x 10²³ grams

12. The molar mass of butane, C₄H₁₀ is approximately:

    1.   ?    58 grams
    2.   ?    13 grams
    3.   ?    22 grams
    4.   ?    48 grams

13. What is the mass of two moles of gas propane gas, C₃H₈?

    1.   ?    44 grams
    2.   ?    88 grams
    3.   ?    22 grams
    4.   ?    11 grams

14. What volume would be occupied by two mole of propane gas, C₃H₈, at standard conditions?

    1.   ?    44.8 liters
    2.   ?    88 liters
    3.   ?    22. 4 liters
    4.   ?    11.2 liters

15. How many moles of propane gas, C₃H₈, are contained in 11 grams of the gas at standard conditions?

    1.   ?    0.25 moles
    2.   ?    1.5 x 10²³ moles
    3.   ?    4 moles
    4.   ?    11 x 10²³ moles

16. How many molecules are contained in 3 moles of water molecules, H₂O?

    1.   ?    54 molecules
    2.   ?    6 molecules
    3.   ?    1.8 x 10²⁴ molecules
    4.   ?    3 x 10²³ molecules

17. What is the mass of 4 moles of hydrogen molecules (H₂)?

    1.   ?    0.5 grams
    2.   ?    8 grams
    3.   ?    2 grams
    4.   ?    4 grams

18. What volume is occupied by 4 moles of hydrogen molecules (H₂) at standard conditions?

    1.   ?    89.6 liters
    2.   ?    72 liters
    3.   ?    5.6 liters
    4.   ?    2.4 x 10²⁴ molecules

19. How many moles of hydrogen molecules (H₂) are present in 9 x 10²³ molecules of hydrogen?

    1.   ?    9 x 10²³ moles
    2.   ?    1.5 moles
    3.   ?    1.8 x 10²⁴ moles
    4.   ?    4.5 x 10²³ mole

20. What volume is occupied by 10 moles of ammonia, NH₃, at standard conditions?

    1.   ?    170 liters
    2.   ?    6 x 10²⁴ liters
    3.   ?    224 liters
    4.   ?    32.4 moles

21. How many molecules of ammonia are contained in 10 moles of ammonia, NH₃?

    1.   ?    6 x 10²⁴ molecules
    2.   ?    6 x 10²² molecules
    3.   ?    170 molecules
    4.   ?    27 molecules

22. How many moles of water molecules, H₂O, are present in a 27 gram sample of water?

    1.   ?    2 moles
    2.   ?    2/3 mole
    3.   ?    1.5 moles
    4.   ?    9 x 10²³ moles

23. How many moles of methane molecules, CH₄, are in 80 grams of methane?

    1.   ?    0.201 moles
    2.   ?    5 moles
    3.   ?    80 x 10²³ moles
    4.   ?    6.02 x 10⁸⁰ moles

24. How many moles of methane gas molecules, CH₄, are in 11.2 liters of methane at standard conditions?

    1.   ?    0.5 moles
    2.   ?    11.2 moles
    3.   ?    27.2 moles
    4.   ?    179.2 moles

25. What is the volume occupied by 40 grams of argon gas (Ar) at standard conditions?

    1.   ?    1 liter
    2.   ?    22.4 liters
    3.   ?    6.02 x 10²³ liters
    4.   ?    896 liters

26. How many atoms are contained in 10 grams of argon gas (Ar)?

    1.   ?    10 atoms
    2.   ?    1.5 x 10²³ atoms
    3.   ?    6 x 10²⁴ atoms
    4.   ?    6 x 10²² atoms

27. About how many atoms of helium would be found in 2 grams of helium?

    1.   ?    6 x 10²³
    2.   ?    3 x 10²³
    3.   ?    2
    4.   ?    4.00

28. How many moles of ethane gas, C₂H₆ are in 15 grams of the compound?

    1.   ?    0.5 moles
    2.   ?    2 moles
    3.   ?    3 x 10²³ moles
    4.   ?    45 moles

29. Approximately how many atoms of carbon are present in a 120 gram sample of carbon?

    1.   ?    6 x 10²⁴ atoms
    2.   ?    6 x 10²² atoms
    3.   ?    10 atoms
    4.   ?    1440 atoms

30. How many moles of argon gas (Ar) are present in 5.6 liters of argon gas at standard conditions?

    1.   ?    0.25 moles
    2.   ?    5.6 moles
    3.   ?    4 moles
    4.   ?    28 moles

31. What volume would be occupied by 120 grams of argon gas (Ar) at standard conditions?

    1.   ?    67.2 liters
    2.   ?    3 liters
    3.   ?    120 liters
    4.   ?    0.186 liters

32. Al + O₂ --> Al₂O₃
    
    When the equation above is correctly balanced, the coefficient on Al is:
    

    1.   ?    1
    2.   ?    2
    3.   ?    3
    4.   ?    4
    5.   ?    5

33. Al + O₂ --> Al₂O₃
    
    When the equation above is correctly balanced, the coefficient on O₂ is:
    

    1.   ?    1
    2.   ?    2
    3.   ?    3
    4.   ?    4
    5.   ?    5
    6.   ?    6

34. Al + O₂ --> Al₂O₃
    
    When the equation above is correctly balanced, the coefficient on Al₂O₃ is:
    

    1.   ?    1
    2.   ?    2
    3.   ?    3
    4.   ?    4
    5.   ?    5
    6.   ?    6

35. H₂ + N₂ --> NH₃
    
    When the equation above is correctly balanced, the coefficient on H₂ is:
    

    1.   ?    1
    2.   ?    2
    3.   ?    3
    4.   ?    4
    5.   ?    5
    6.   ?    6

36. H₂ + N₂ --> NH₃
    
    When the equation above is correctly balanced, the coefficient on N₂ is:
    

    1.   ?    1
    2.   ?    2
    3.   ?    3
    4.   ?    4
    5.   ?    5
    6.   ?    6

37. H₂ + N₂ --> NH₃
    
    When the equation above is correctly balanced, the coefficient on NH₃ is:

    1.   ?    1
    2.   ?    2
    3.   ?    3
    4.   ?    4
    5.   ?    5
    6.   ?    6

38. C₂H₂ + O₂ --> CO₂ + H₂O
    
    When the equation above is correctly balanced, the coefficient on C₂H₂ is:

    1.   ?    1
    2.   ?    2
    3.   ?    3
    4.   ?    4
    5.   ?    5
    6.   ?    6

39. C₂H₂ + O₂ --> CO₂ + H₂O
    
    When the equation above is correctly balanced, the coefficient on O₂ is:

    1.   ?    1
    2.   ?    2
    3.   ?    3
    4.   ?    4
    5.   ?    5
    6.   ?    6

40. C₂H₂ + O₂ --> CO₂ + H₂O
    
    When the equation above is correctly balanced, the coefficient on CO₂ is:

    1.   ?    1
    2.   ?    2
    3.   ?    3
    4.   ?    4
    5.   ?    5
    6.   ?    6

41. C₂H₂ + O₂ --> CO₂ + H₂O
    
    When the equation above is correctly balanced, the coefficient on H₂O is:

    1.   ?    1
    2.   ?    2
    3.   ?    3
    4.   ?    4
    5.   ?    5
    6.   ?    6

42. Ca(OH)₂ + H₃PO₄ --> Ca₃(PO₄)₂ + H₂O
    
    When the equation above is correctly balanced, the coefficient on Ca(OH)₂ is:

    1.   ?    1
    2.   ?    2
    3.   ?    3
    4.   ?    4
    5.   ?    5
    6.   ?    6

43. Ca(OH)₂ + H₃PO₄ --> Ca₃(PO₄)₂ + H₂O
    
    When the equation above is correctly balanced, the coefficient on H₃PO₄ is:

    1.   ?    1
    2.   ?    2
    3.   ?    3
    4.   ?    4
    5.   ?    5
    6.   ?    6

44. Ca(OH)₂ + H₃PO₄ --> Ca₃(PO₄)₂ + H₂O
    
    When the equation above is correctly balanced, the coefficient on Ca₃(PO₄)₂ is:

    1.   ?    1
    2.   ?    2
    3.   ?    3
    4.   ?    4
    5.   ?    5
    6.   ?    6

45. Ca(OH)₂ + H₃PO₄ --> Ca₃(PO₄)₂ + H₂O
    
    When the equation above is correctly balanced, the coefficient on H₂O is:

    1.   ?    1
    2.   ?    2
    3.   ?    3
    4.   ?    4
    5.   ?    5
    6.   ?    6

46. Ca(OH)₂ --> CaO + H₂O
    
    When the equation above is correctly balanced, the coefficient on Ca(OH)₂ is:

    1.   ?    1
    2.   ?    2
    3.   ?    3