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 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

**Question 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}

**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?**

Al_{2}O_{3} + 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 10**^{21} 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, C**_{8}H_{9}NO_{2}?

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

**Question 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}

**Question 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