Chemistry Chapter 2

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C

1) Identify the description of an atom.
A) neutrons and electrons in nucleus; protons in orbitals
B) neutrons in nucleus; protons and electrons in orbitals
C) protons and neutrons in nucleus; electrons in orbitals
D) protons and electrons in nucleus; neutrons in orbitals
E) electrons in nucleus; protons and neutrons in orbitals

E

13) Calculate the atomic mass of silver if silver has 2 naturally occurring isotopes with the following masses and natural abundances:

Ag-107 106.90509 amu 51.84%
Ag-109 108.90476 amu 48.46%

A) 107.90 amu
B) 108.00 amu
C) 107.79 amu
D) 108.32 amu
E) 108.19 amu

B

14) Which of the following contains the MOST atoms? You shouldn't need to do a calculation here.
A) 10.0 g Ne
B) 10.0 g He
C) 10.0 g Ar
D) 10.0 g Kr
E) 10.0 g Mg

B

15) How many silver atoms are contained in 3.75 moles of silver?
A) 6.23 × 1024 silver atoms
B) 2.26 × 1024 silver atoms
C) 1.61 × 1023 silver atoms
D) 2.44 × 1026 silver atoms
E) 6.50 × 1025 silver atoms

A

16) How many argon atoms are contained in 7.66 x 105 mmol of argon?
A) 4.61 × 1026 Ar atoms
B) 1.84 × 1028 Ar atoms
C) 1.15 × 1028 Ar atoms
D) 7.86 × 1020 Ar atoms
E) 3.24 × 1026 Ar atoms

A

17) What mass (in g) does 3.99 moles of Kr have?
A) 334 g
B) 476 g
C) 211 g
D) 240 g
E) 144 g

A

18) How many moles of potassium are contained in 449 g of potassium?
A) 11.5 moles
B) 17.6 moles
C) 69.2 moles
D) 23.9 moles
E) 41.5 moles

B

19) How many moles are in 2.16 x 1024 atoms of lead?
A) 35.9 moles
B) 3.59 moles
C) 0.359 moles
D) 6.08 moles
E) 1.79 moles

B

20) How many molecules are in 2.50 moles of CO2?
A) 4.52 x 1024 atoms
B) 1.51 x 1024 atoms
C) 5.02 x 1023 atoms
D) 3.01 x 1024 atoms
E) 7.53 x 1023 atoms

Number of grams/molar mass

Number of moles =

Number of moles x molar mass

Number of grams =

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