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6.2 Reivew
Test Description: Molar Mass, Converting Mass, Moles, and Number of Atoms, Percent Composition
Instructions: Answer all questions to get your test result.
1) Find the molar mass of NaBr
A
49.1 g/mol
B
102.9 g/mol
C
58.44 g/mol
D
110 g/mol
2) Find the molar mass for (NH4)2CO3
A
303.3 g/mol
B
46.04 g/mol
C
151/2 g/mol
D
96.0 g/mol
3) How many moles are in 68 grams of copper(II) hydroxide - Cu(OH)2?
A
1.43 moles
B
0.112 moles
C
0.696 moles
D
72.1 moles
4) How many moles are in 98.3 grams of aluminum hydroxide?
A
4.14 moles
B
1.26 moles
C
0.81 moles
D
2.11 moles
5) How many grams are in 0.00023 moles of calcium phosphate -- Ca3(PO4)2?
A
0.71 grams
B
0.071 grams
C
71 grams
D
7.1 grams
6) How many grams are in 4.5 moles of sodium fluoride?
A
190 grams
B
19 grams
C
1.9 grams
D
0.19 grams
7) How many atoms are in a 0.63 gram sample of Sb2S3?
A
0.11 x 10^22 atoms
B
1.1 x 10^21 atoms
C
0.00185 x 10^23 atoms
D
11 x 10^23 atoms
8) How many atoms are in a 5.48 gram sample of SiO2?
A
165 x 10^26 atoms
B
1.65 atoms
C
1.65 x 10^23 atoms
D
16.5 x 10^24 atoms
9) What percent of hydrogen is in the compound (NH4)2S?
A
1%
B
41%
C
11%
D
47%
10) What percent of potassium is in KMnO4?
A
25%
B
2.5%
C
40%
D
35%
*select an answer for all questions
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