Chapter 24 stoichiometry

What is meant when a reactant is in (stoichiometric) excess

More moles of the reactant present than what is required

Not all of the reactant in excess is used up - some will remain unused at the end of the reaction

What is meant when a reactant is referred to as the limiting reagent

The limiting reactant is the reactant not in excess

All of the limiting reagent is used up - therefore its amount determines the amount of the products formed

Find the mass of a liquid

Density = mass÷volume

Mass = density x volume

Percentage yield

(Actual yield of product ÷ theoretical yield of product) x 100