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 1023 '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