How do you convert formula units to mass?

To convert formula units to mass, first determine the number of formula units you have, then calculate the molar mass of the compound by adding the atomic masses of all atoms in its formula. Use Avogadro's number (approximately (6.022 \times 10^{23}) units/mol) to convert formula units to moles. Finally, multiply the number of moles by the molar mass to obtain the mass in grams.