Conversion Factor

A ratio (or fraction) that represents the relationship between two different
units.
Formula Unit

The representative particle of a substance. It is the smallest unit of a
substance that still retains that substance's properties and is the simplest way
to write the formula of the substance without coefficients.
Gram Formula Mass

The mass of one mole of compound.
Gram Molecular Mass

The mass of one mole of a molecular substance.
Mole

A measure of amount. 1 mole equals 6.02×10^{23} items of something.
The number is so massive because moles are used to measure the amount of
molecules, atoms, and other incredibly miniscule particles.
Mole ratio

The ratio between any two constituents in chemical equation
Standard Temperature and Pressure

The arbitrarily decided standard conditions at which experiments are done: 1 atm
and 273 degrees Kelvin (0 degrees Celsius).
General Conversion Factor Equation

Conversion Factor = 

Converting from Formula Units to Moles

Moles = 

Converting from Volume of a Gas to Moles

moles = 

Converting from Mass to Moles

Moles = 

Converting from Molality of a Solution to Moles

Moles = molality × kilograms of solution
Converting from Molarity of a Solution to Moles

Moles = molarity × liters of solution