Unit 3 Test Review

Question 1

Consider the reaction

N2 + 3H2 –> 2NH3. If I have 4.67 moles of NH3, how many miles of N2 and H2 do I have?

Answer 1

2. 34 mol N2

7. 01 mol H2

Question 2

Consider the reaction
2N2O5 —> 4NO2 + O2
If I have 2.36 miles of N2O5, how many moles of NO2 and O2 do I have?

Answer 2

4. 72 mol NO2

1. 18 mol O2

Question 3

What is meant when we say that a reaction has reached “equilibrium”?

Answer 3

The rate of formation of products = the rate of formation of reactants

Question 4

If K for a given reaction is very large, would there be a large amount of products or reactants in the mixture?

Answer 4

Products

Question 5

If K for a given reaction is very small, would there be a large amount of products or reactants in the mixture?

Answer 5

Reactants

Question 6

If Q is greater than K, then the concentration of products needs to:

Answer 6

Decrease

Question 7

If Q is less than K, then the concentration of products needs to

Answer 7

Increase

Question 8

How is the change of molarity of a reactant and product calculated?

Answer 8

Final molarity - initial molarity