Stoichiometry, % yield, 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 percent yield?

Back

Percent yield is a measure of the efficiency of a reaction, calculated as (actual yield / theoretical yield) x 100%.

Front

How do you identify the limiting reactant in a reaction?

Back

To identify the limiting reactant, calculate the moles of each reactant and determine which one produces the least amount of product.

Front

What is the theoretical yield?

Back

The theoretical yield is the maximum amount of product that can be produced from a given amount of reactants, based on stoichiometric calculations.

Front

Calculate the percent yield if the theoretical yield is 50g and the actual yield is 40g.

Back

Percent yield = (40g / 50g) x 100% = 80%.

Front

In the reaction 2H2 + O2 → 2H2O, if you start with 4 moles of H2 and 2 moles of O2, which is the limiting reactant?

Back

O2 is the limiting reactant because it will be completely consumed first.

Front

What is the formula for calculating percent yield?

Back

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

Front

If you have 10 moles of A and 15 moles of B in the reaction A + 2B → C, how many moles of C can be produced?

Back

5 moles of C can be produced, as A is the limiting reactant.

Front

What is the significance of the coefficients in a balanced chemical equation?

Back

The coefficients indicate the ratio of moles of reactants and products involved in the reaction.