Stoichiometry and Limiting Reactants

Front

What is Stoichiometry?

Back

Stoichiometry is the branch of chemistry that deals with the calculation of reactants and products in chemical reactions based on the conservation of mass.

Front

Define Limiting Reactant.

Back

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

Front

What is the purpose of balancing chemical equations?

Back

Balancing chemical equations ensures that the same number of each type of atom appears on both sides of the equation, reflecting the conservation of mass.

Front

How do you determine the limiting reactant in a reaction?

Back

To determine the limiting reactant, calculate the moles of each reactant and compare the mole ratios from the balanced equation to see which reactant will run out first.

Front

What is the mole ratio in a balanced equation?

Back

The mole ratio is the ratio of moles of one substance to the moles of another substance in a balanced chemical equation.

Front

Calculate the moles of water produced from 8 moles of hydrogen in the reaction 2H₂ + O₂ → 2H₂O.

Back

8 moles of H₂ will produce 8 moles of H₂O.

Front

What is the molar mass of SO₂?

Back

The molar mass of SO₂ (sulfur dioxide) is approximately 64.07 g/mol.

Front

How do you convert grams to moles?

Back

To convert grams to moles, divide the mass of the substance (in grams) by its molar mass (in g/mol).

Front

What is the balanced equation for the reaction of calcium carbide with water?

Back

The balanced equation is CaC₂(s) + 2H₂O(l) → C₂H₂(g) + Ca(OH)₂(aq).

Front

If 250g of H₂SO₄ reacts completely, how do you find the mass of Al₂(SO₄)₃ produced?

Back

Use stoichiometry: convert grams of H₂SO₄ to moles, use the mole ratio from the balanced equation, and convert moles of Al₂(SO₄)₃ back to grams.