Units or values for the above physical quantities are as follows:

N:  is  number of things, i.e. atoms, moleculesor particles

N_A = 6.022 x 10²³ mol^-1

n is number of moles. Unit:  mol

m is mass. Unit: g

M is the molar mass (molecular mass, atomic mass or formulamass - older designations: molecular weight, atomic weight.)  Unitsg mol^-1

ρ is the density usually with unitsof g mL^-1 or equilantly kg L^-1

ν is the reaction stoichiometric number(coefficients used in the balanced reaction) and is an exact number.