What is n in the equation of the ideal gas law?

The calculations for the ideal gas law are comparison of the Pressure and Volume of gas based upon amount and temperature.
The basic formula is $\mathrm{PV}=\mathrm{nRT}$ where
$P=$ Pressure in atmospheres (atm)
$V=$ Volume in Liters (L)
$\mathrm{n}=$ $\#$ of moles (mol)
$\mathrm{R}=$ the Ideal Gas Law Constant
$\mathrm{T}=$ Temperature in Kelvin (K)
The value $\mathrm{n}$ is the amount of the gas measured as moles.
One may need to convert a mass to moles by dividing the given mass of the gas by the molar mass of the gas to get moles.
The ideal gas law constant is a combination of these values based upon the volume of one mole of a gas at Standard Temperature and Pressure (STP).
$\frac{0.082051(\mathrm{atm})(L)}{(mol)(K)}$