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

What is a limiting reactant?

Back

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

Front

How do you determine the mole ratio from a balanced chemical equation?

Back

The mole ratio is determined by the coefficients of the reactants and products in a balanced chemical equation.

Front

What is the purpose of balancing a chemical equation?

Back

Balancing a chemical equation ensures that the number of atoms for each element is the same on both sides of the equation, adhering to the law of conservation of mass.

Front

What is percent yield in a chemical reaction?

Back

Percent yield is the ratio of the actual yield (the amount of product obtained) to the theoretical yield (the amount of product expected based on stoichiometry), expressed as a percentage.

Front

How do you calculate percent yield?

Back

Percent yield = (actual yield / theoretical yield) x 100%.

Front

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

Back

CaC₂(s) + 2 H₂O(l) → C₂H₂(g) + Ca(OH)₂(aq).

Front

If 8 moles of H₂ are used, how many moles of water are produced in the reaction 2H₂ + O₂ → 2H₂O?

Back

8 moles of water are produced.

Front

What is the first step in solving a stoichiometry problem?

Back

The first step is to write a balanced chemical equation.

Front

What is the mole ratio of H₂O to H₃PO₄ in the reaction P₄O₁₀ + 6 H₂O → 4 H₃PO₄?

Back

The mole ratio of H₂O to H₃PO₄ is 6:4.