AnswersLA-Chemistry AUnit Test

Unit Test Answers

12 verified answers
1
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Avogadro's number represents the number of units in a mole. What is this value?

A
3.01 × 10
B
6.02 × 10
C
1.20 × 10
D
3.60 × 10
2
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Use the periodic table to identify the molar mass of each element below. Answer without doing any calculations.Beryllium (Be):

A
4.00 g/mol
B
5.01 g/mol
C
9.01 g/mol
3

Silicon (Si):

A
14.00 g/mol
B
14.09 g/mol
C
28.09 g/mol
4

Calcium (Ca):

A
20.00 g/mol
B
20.08 g/mol
C
40.08 g/mol
5

Rhodium (Rh):

A
45.00 g/mol
B
57.91 g/mol
C
102.91 g/mol
6

Use the periodic table to calculate the molar mass of each compound below. All answers must have 2 decimal places.Sodium hydroxide (NaOH): g/mol

Answer:

40.00

7

Water (H2O): g/mol

Answer:

18.02

8

Glucose (C6H12O6): g/mol

Answer:

180.18

9

Calcium sulfate (CaSO4): g/mol

Answer:

136.15

10

Magnesium phosphate (Mg3(PO4)2): g/mol

Answer:

262.84

11

The molar mass of copper(II) chloride (CuCl2) is 134.45 g/mol. How many formula units of CuCl2 are present in 17.6 g of CuCl2?

A
7.88 × 1022 formula units
B
1.84 × 1023 formula units
C
1.91 × 1023 formula units
D
1.42 × 1024 formula units
12

The molar mass of barium nitrate (Ba(NO3)2) is 261.35 g/mol. What is the mass of 5.30 × 1022 formula units of Ba(NO3)2?

A
0.0900 g
B
12.0 g
C
23.0 g
D
3,130 g

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Unit Test Answers — LA-Chemistry A