UNIT 3 TEST #1 (REG. CHEM.) - WRITTEN PART

Part 1 - Fill in the following chart.

 

Name

Atomic #

Mass #

# of no

# of e-

# of p+

Symbol

1.)

nitrogen - 14

7

14

7

7

7

14N

2.)

zinc - 65

30

65

35

30

30

65Zn

3.)

iron - 55

26

55

29

26

26

55Fe

4.)

iodine - 126

53

126

73

53

53

126I

5.)

titanium - 48

22

48

26

22

22

48Ti

6.)

tungsten - 184

74

184

110

74

74

184W

7.)

argon - 39

18

39

21

18

18

39Ar

Part 2 - Solve the following problems.  Show your work!  Don't forget SF's and units with your answer!
8.)  What is the mass of 4.329 moles of tin?    4.329 moles | 118.7 g = 513.9 grams
                                                                                     | 1 mole

9.) How many atoms are contained in 35.36 grams of potassium?    35.36 g | 1 mole = 0.9043 moles
                                                                                                             | 39.1 g
        0.9043 moles | 6.022 x 1023 atoms = 5.446 x 1023 atoms K
                             | 1 mole

10.)  What is the mass of 9.8 x 1023 molecules of CO2?   
9.8 x 10
23 'cules CO2 | 1 mole                  = 1.6 moles CO2
                                | 6.022 x 1023 'cules
1.6 moles CO2 | 44.0 grams = 70. grams CO2
                      | 1 mole

11.)  Using the following data, calculate the average atomic mass of neon.  Round your answer to one place to the
        right of the decimal point.

        Neon - 20 has a percent abundance of 90.92 %.
        Neon - 21 has a percent abundance of 0.257 %.
        Neon - 22 has a percent abundance of 8.82 %.
20 x 0.9092 = 18.184
21 x 0.00257 = 0.05397
22 x 0.0882 = 1.9404
                     20.17837  ~  20.2 amu

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