Stoich, Limiting and % Yield

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 an excess reactant?

Back

An excess reactant is a substance that is not completely consumed in a chemical reaction and remains after the reaction has occurred.

Front

How do you calculate the theoretical yield?

Back

The theoretical yield is calculated based on the balanced chemical equation and the amount of limiting reactant used.

Front

What is percent yield?

Back

Percent yield is the ratio of the actual yield to the theoretical yield, multiplied by 100, indicating the efficiency of a reaction.

Front

Given the reaction: 2C2H6 + 7O2 → 4CO2 + 6H2O, how many moles of CO2 are produced from 1 mole of C2H6?

Back

4 moles of CO2 are produced.

Front

In the reaction Cu + 4HNO3 -> Cu(NO3)2 + 2H2O + 2NO2, what is the mass of H2O produced from 32 grams of Cu?

Back

18 grams of H2O are produced.

Front

Using the equation: Fe2O3 + 3H2 → 2Fe + 3H2O, how many moles of iron can be made from 6 moles of H2?

Back

4 moles of iron can be made.

Front

What is the formula for calculating percent yield?

Back

Percent Yield = (Actual Yield / Theoretical Yield) x 100.

Front

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

Back

Coefficients indicate the relative number of moles of each reactant and product involved in the reaction.