STOICHIOMETRY & MORE

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 theoretical yield.

Back

Theoretical yield is the maximum amount of product that can be produced in a chemical reaction based on the balanced equation, assuming complete conversion of reactants.

Front

How do you calculate percent yield?

Back

Percent yield = (Actual yield / Theoretical yield) x 100%.

Front

What is actual yield?

Back

Actual yield is the amount of product that is actually obtained from a chemical reaction, measured in the lab.

Front

What is the mole ratio in a balanced chemical 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

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

Back

5.2 g of hydrogen are produced.

Front

What does it mean if a reaction has a percent yield of less than 100%?

Back

A percent yield of less than 100% indicates that the reaction did not go to completion, or that some product was lost during the process.

Front

In the reaction P4 + 6Cl2 → 4PCl3, what is the theoretical yield if 75.0 g of P4 is used?

Back

The theoretical yield is calculated based on the stoichiometry of the reaction.

Front

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

Back

A balanced chemical equation provides the mole ratios needed to calculate the amounts of reactants and products involved in a reaction.

Front

How many moles of oxygen are produced from the decomposition of 6.7 moles of KClO3?

Back

10.1 moles of oxygen are produced.