Chemistry Stoichiometry Review

Front

What is stoichiometry?

Back

Using the balanced reaction and moles to calculate amounts needed and used.

Front

What is a limiting reactant?

Back

The reactant that is completely consumed in a chemical reaction, determining the maximum amount of product that can be formed.

Front

What is an excess reactant?

Back

The reactant that remains after a chemical reaction has gone to completion.

Front

How do you determine the number of moles from grams?

Back

Use the formula: Moles = Mass (g) / Molar Mass (g/mol).

Front

In the reaction 2H₂ + O₂ → 2H₂O, how many moles of water are produced from 8 moles of H₂?

Back

8 moles of water.

Front

In the reaction 2Na + 2H₂O → 2NaOH + H₂, how many grams of hydrogen are produced from 120 g of Na?

Back

5.27 g of hydrogen.

Front

What happens when the limiting reactant is used up?

Back

The chemical reaction stops.

Front

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

Back

2 moles of H₂ react with 1 mole of O₂ to produce 2 moles of H₂O.

Front

How do you calculate the theoretical yield?

Back

Theoretical yield is calculated based on the limiting reactant and stoichiometric ratios from the balanced equation.

Front

What is the purpose of balancing a chemical equation?

Back

To ensure that the number of atoms for each element is the same on both sides of the equation.