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Percent Composition by mass
The percent that each element in a compound contributes to the total mass of the compound.
Empirical formula
Determined by the simplest whole-number ratio of every atom in the compound. It’s a formula showing the proportions of an element present in a compound.
Molecular formula
The actual formula for the molecule
Stoichiometry
Scientists perform chemical calculations or stoichiometry to measure the number of reactants and products in a chemical reaction.
Mole to Mole Stoichiometry
In mole to mole stoichiometry, we start with moles and end with moles.
Volume to Volume Stoichiometry
Equal volumes of all gases are the same at standard temperature and pressure (STP). You can get the volume ratios from the balanced equation.
Limiting Reactant
The reactant that is used up first in a chemical reaction
Excess Reactant
Reactants that are left over when the limiting reactant is gone
The theoretical yield
The amount of product that would be produced if the limiting reactant completely reacted.
The actual yield
The amount of product actually produced in the reaction.
The percentage yield
The ratio of actual yield to theoretical yield.
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