CHEM 1100

Practice Test 2

*Note: These questions are representative of the types of questions you can expect on the test.
The actual test will be longer, typically between 20-40 questions.
You will need to bring a SCANTRON answer sheet to each test.*

1. When 22.0 g NaCl and 21.0 g H_{2}SO_{4 }
are mixed and react according to the equation below, which is the limiting reagent?

2 NaCl + H_{2}SO_{4} ---> Na_{2}SO_{4} + 2 HCl

a. NaCl

b. H_{2}SO_{4}

c. Na_{2}SO_{4}

d. HCl

e. No limiting reagent

2. What is the maximum number of grams of ammonia, NH_{3},
that can be obtained from 10.0 g of H_{2} reacting with 80.0 g of N_{2}?

N_{2} + 3 H_{2} ---> 2 NH_{3}

a. 28.4 g

b. 48.6 g

c. 56.7 g

d. 90.0 g

e. 97.1 g

3. What is the theoretical yield of aluminum that can be produced by the reaction of
60.0 g of aluminum oxide with 30.0 g of carbon acording tothe following equation?

Al_{2}O_{3} + 3 C ---> 2 Al + 3 CO
a. 30.0 g

b. 7.9 g

c. 101.2 g

d. 45.0 g

e. 31.8 g

4. What is the mass in grams of one arsenic atom?

a. 5.48 x 10^{-23}

b. 33.0 g

c. 74.9 g

d. 1.24 x 10^{-22} g

e. 8.04 x 10^{21} g

5. The mass of 1.63 x 10^{21} silicon atoms is:

a. 2.71 x 10^{-23} g

b. 4.58 x 10^{22} g

c. 28.08 g

d. 1.04 x 10^{4 }g

e. 7.60 x 10^{-2} g

6. Calculate the number of moles in 12.0 g of phosphorus

a. 0.387 mol

b. 0.80 mol

c. 2.58 mol

d. 12.0 mol

e. 6.02 x 10^{23} mol

7.Which is the molar mass of acetaminophen, C_{8}H_{9}NO_{2}?

a. 151 g

b. 76 g

c. 43 g

d. 163 g

e. 125 g

8. How many grams of sulfur are contained in 6.00 g of Fe_{2}(SO_{4})_{3} ?

a. 2.40 g

b. 0.48 g

c. 6.00 g

d. 0.92 g

e. 1.44 g

9. What is the coefficent
of H_{2}SO_{4} when the following equation is properly
balanced with the smallest set of whole numbers?

___ Ca_{3}(PO_{4})_{2} + ___ H_{2}SO_{4} ---> ___ CaSO_{4} + ___ H_{3}PO_{4}

a. 3

b. 8

c. 10

d.11

e. none of the above

10. What is the coefficent
of O_{2} when the following equation is properly
balanced with the smallest set of whole numbers?

___ CH_{3}OH + ___ O_{2} ---> ___CO_{2} + ___ H_{2}O

a. 1

b. 2

c. 3

d. 7

e. none of the above

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