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

A 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 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 the molar mass of NaCl?

Back

The molar mass of NaCl (sodium chloride) is approximately 58.44 g/mol.

Front

How many grams are in 1 mole of KBr?

Back

The molar mass of KBr (potassium bromide) is approximately 119.00 g/mol.

Front

What is the balanced equation for the reaction of aluminum with sulfuric acid?

Back

2Al + 3H2SO4 → Al2(SO4)3 + 3H2.

Front

If you have 250 g of H2SO4, how do you find the grams 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.

Front

What is the formula to calculate percent yield?

Back

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

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.