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 H2SO4 are mixed and react according to the equation below, which is the limiting reagent?

2 NaCl + H2SO4 ---> Na2SO4 + 2 HCl

a. NaCl
b. H2SO4
c. Na2SO4
d. HCl
e. No limiting reagent


2. What is the maximum number of grams of ammonia, NH3, that can be obtained from 10.0 g of H2 reacting with 80.0 g of N2?

N2 + 3 H2 ---> 2 NH3

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?

Al2O3 + 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 1021 g


5. The mass of 1.63 x 1021 silicon atoms is:

a. 2.71 x 10-23 g
b. 4.58 x 1022 g
c. 28.08 g
d. 1.04 x 104 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 1023 mol


7.Which is the molar mass of acetaminophen, C8H9NO2?

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 Fe2(SO4)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 H2SO4 when the following equation is properly balanced with the smallest set of whole numbers?

___ Ca3(PO4)2 + ___ H2SO4 ---> ___ CaSO4 + ___ H3PO4
a. 3
b. 8
c. 10
d.11
e. none of the above


10. What is the coefficent of O2 when the following equation is properly balanced with the smallest set of whole numbers?

___ CH3OH + ___ O2 ---> ___CO2 + ___ H2O

a. 1
b. 2
c. 3
d. 7
e. none of the above


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