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YORK COLLEGE/CUNY Chemistry 108 Exam 2 | 2022 UPDATE

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YORK COLLEGE/CUNY Chemistry 108 Exam 2 Part I: Multiple Choice (60 pts) 1. What is the molecular mass of Br2? A) 79.90 amu B) 79.90 g C) 159.8 amu D) 159.8 g E) 2.65 x 10-22 amu 2. Which one of the following does not represent 1.000 mol of the indicated substance? A) 6.022 × 1023 C atoms ...

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  • February 15, 2022
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  • 2021/2022
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  • york collegecuny chemistry 108 exam 2 part i multiple choice 60 pts 1 what is the molecular mass of br2 a 7990 amu b 7990 g c 1598 amu d 1598 g e 265 x 10 22 amu 2 which one of the fo

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YORK COLLEGE/CUNY Chemistry 108 Exam 2

Part I: Multiple Choice (60 pts)

1. What is the molecular mass of Br2?
A) 79.90 amu
B) 79.90 g
C) 159.8 amu
D) 159.8 g
E) 2.65 x 10-22 amu


2. Which one of the following does not represent 1.000 mol of the indicated substance?
A) 6.022 × 1023 C atoms
B) 26.00 g Fe
C) 12.01 g C
D) 65.39 g Zn
E) 6.022 × 1023 Fe atoms


3. Boron obtained from borax deposits in Death Valley consists of two isotopes. They are
boron-10 and boron-11 with atomic masses of 10.013 amu and 11.009 amu,
respectively. The atomic mass of boron is 10.81 amu (see periodic table). Which
isotope of boron is more abundant, boron-10 or boron-11?
A) Cannot be determined from data given
B) Neither, their abundances are the same.
C) Boron-10
D) Boron-11


4. How many C atoms are in 5.50 g of C?
A) 5.01 x 1022 C atoms
B) 3.31 x 1024 C atoms
C) 6.02 x 1023 C atoms
D) 2.76 x 1023 C atoms
E) 5.50 x 1023 C atoms




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, 5. Calculate the average atomic mass of lithium using the following data:
Isotope Abundance Mass
6
Li 7.5 % 6.0151 amu
7
Li 92.5% 7.0160 aum
A) 6.51 amu
B) 6.02 amu
C) 6.94 amu
D) 7.02 amu
E) 6.50 amu


6. Determine the number of moles of aluminum in 96.7 g of Al.
A) 0.279 mol
B) 3.58 mol
C) 7.43 mol
D) 4.21 mol
E) 6.02 × 1023 mol


7. Calculate the molar mass of Ba(NO3)2.
A) 199.3 g/mol
B) 323.3 g/mol
C) 247.3 g/mol
D) 261.3 g/mol
E) 398.6 g/mol


8. What is the mass of 0.0250 mol of P2O5?
A) 35.5 g
B) 5676 g
C) 0.0250 g
D) 1.51 × 1022 g
E) 3.55 g


9. A compound with an empirical formula of C2H2Br3 has a molar mass of 531.47 g/mol.
What is the molecular formula?
A) C2H2Br3
B) C4H4Br6
C) CHBr
D) C4H4Br3
E) C6H6Br9




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