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CHEM1100

Practice Test 2

Note: These questions are representative of the types you can expect on the test. The actual test will be longer, typically between 20-40 questions.
You will need to bring a SCANTRON and pencil to each class test.
Instructions: Select the best answer then click on "get answer" box.

Question 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

Question 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

Question 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 according tothe following equation?

Al₂O₃ + 3 C ---> 2 Al + 3 CO

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

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

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

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

Question 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

Question 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

Question 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 avove