Chapter 9 Practice quiz

4NH3 + 5O2-->4NO + 6H2O

What is the total number of moles of H2O produced when 12 mole of NH3 is completely consumed?

• 18

• 16

• 24

• 12

2 C2H6 + 7 O2 → 4 CO2 + 6 H2O

Ethane (C2H6) combusts in the above reaction. What is the mole ratio of carbon dioxide to water?

• 7 mol of CO2 for every 4 mol of H2O

• 2 mol of CO2 for every 6 mol of H2O

• 4 mol of CO2 for every 6 mol of H2O

• 2 mol of CO2 for every 4 mol of H2O

2H2  +   O2  →  2H2O

How many moles of oxygen are consumed if 8 moles H2 are used?

• 6

• 2

• 1

• 4

N2 +  3H2 → 2NH3

How many moles of hydrogen are needed to react with 2 moles of nitrogen?

• 6

• 12

• 3

• 4

Balance the following reaction :

CaC₂(s) + H₂O(l) --> C₂H₂(g) + Ca(OH)₂(aq)

• 1, 2, 1, 1

• 2, 1, 4, 1

• 3, 4, 8, 2

• 1, 3, 1, 2

Using the following equation:

Fe2O3(s) + 3H2(g) → 2Fe(s) + 3H2O(l)

How many moles of iron can be made from 3 moles of Fe2O3?

• 3 mols of Fe

• 4 mols of Fe

• 6 mols of Fe

• 1 mol of Fe

Mole Ratios used for conversions are derived from

• The Octet Rule

• The coefficients of the balanced chemical equation

• The valence electrons of a molecule

• The electronegativity of a compound

In the equation 2 Al2O3 --> 4 Al + 3 O2, what is the mole ratio of aluminum to oxygen?

• 1/4

• 2/3

• 4/3

• 3/2

In the reaction 2 H2 + O2 → 2 H2O what is the mole ratio of oxygen to water

• 1/2

• 3/5

• 2/2

• 4/2

Deals with the mass relationships of elements in compounds

• Reaction Stoichiometry

• Avogadro's Number

• Mass Stoichiometry

• Composition Stoichiometry