Mastering Stoichiometry Concepts

What is the balanced equation for the combustion of methane (CH4)?

• CH4 + O2 -> CO + H2O

• CH4 + 2 O2 -> CO2 + 2 H2O

• CH4 + 3 O2 -> 2 CO2 + 2 H2O

• 2 CH4 + 5 O2 -> 4 CO2 + 4 H2O

How many moles of O2 are needed to completely react with 2 moles of H2?

• 3 moles of O2

• 2 moles of O2

• 1 mole of O2

• 0.5 moles of O2

In the reaction 2H2 + O2 → 2H2O, how many moles of water are produced from 3 moles of O2?

• 4 moles of H2O

• 2 moles of H2O

• 3 moles of H2O

• 6 moles of H2O

Balance the equation: C3H8 + O2 → CO2 + H2O.

• C3H8 + 3 O2 → 2 CO2 + 3 H2O

• C3H8 + 5 O2 → 3 CO2 + 4 H2O

• C3H8 + 2 O2 → CO2 + H2O

• C3H8 + 4 O2 → 3 CO2 + 5 H2O

If 4 moles of Na react with 2 moles of Cl2, how many moles of NaCl are produced?

• 6 moles of NaCl

• 4 moles of Cl2

• 4 moles of NaCl

• 2 moles of NaCl

What is the mole ratio of H2 to O2 in the reaction 2H2 + O2 → 2H2O?

• 2:2

• 1:1

• 3:1

• 2:1

How many grams of CO2 are produced when 5 moles of C6H12O6 are completely burned?

• 660 grams

• 2640 grams

• 1320 grams

• 990 grams

In the reaction 2Fe + 3Cl2 → 2FeCl3, how many moles of Cl2 are required for 4 moles of Fe?

• 2 moles of Cl2

• 8 moles of Cl2

• 4 moles of Cl2

• 6 moles of Cl2

What is the molar mass of NaCl?

• 56.12 g/mol

• 60.00 g/mol

• 58.00 g/mol

• 58.44 g/mol

If 10 grams of CaCO3 decomposes, how many moles of CaO are produced?

• 0.2 moles

• 0.05 moles

• 0.1 moles

• 0.0999 moles