Ferric ammonium citrate is a complex compound with a varying chemical formula depending on the specific variety.

The most common form is ferric ammonium citrate (FAC) with the formula [Fe(C6H5O7)]NH4, which has a molar mass of approximately 241.98 g/mol.

Here's how to calculate the molar mass:

* Fe: 55.845 g/mol

* C6H5O7: (12.011 x 6) + (1.008 x 5) + (15.999 x 7) = 191.124 g/mol

* NH4: (14.007 + (1.008 x 4)) = 18.039 g/mol

Adding these together: 55.845 + 191.124 + 18.039 = 241.98 g/mol

Note:

* Some formulations of ferric ammonium citrate contain water molecules, which would increase the molar mass.

* The exact molar mass can vary slightly depending on the specific ratio of ferric ions to citrate ions.

If you need the molar mass of a specific variety of ferric ammonium citrate, please provide the chemical formula or further information.