Module 6: Stoichiometry

Number of molecules or atoms in a mole:

6.02 X 1023

Avogadro’s number

Process by which

the amount of one substance

in a chemical reaction

is related to

the amount of another substance

in a chemical reaction. (156)

The reactant that runs out first in a chemical equation.; It determines the amount of products made. (167)
Limiting reactant

The reactant or reactants

that are left over at the end

of a chemical reaction.; (172)

Excess reactant

The numbers that appear

to the left of the chemical formulas

in a chemical equation.;

They represent the number of moles

of each substance. (173)

Stoichiometric coefficients

The stoichiometric coefficients in a chemical equation relate

the volumes of gases in the equation

as well as

the number of moles of substances

in the equation. (174)


Gay-Lussac’s Law

A chemical formula that provides

the number of each type of atom

in a molecule. (186)

Molecular formula

A chemical formula that tells you

a simple, whole-number ratio

for the atoms in a molecule. (186)

Empirical formula

The mass of

one mole of a given compound

Molar mass

Experimental apparatus consisting of

a glass tube filled with

a small amount of gas. 

Electrodes in the tube allow for the passage of electricity through the gas. (201)

Crookes tube
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