AnswersCR SS Chemistry S2 201819 2026Scientific Notation and Significant Figures

Scientific Notation and Significant Figures Answers

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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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Rhodium (Rh):

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

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
7

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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