1. Identify the Elements and Their Atomic Masses:

* Nitrogen (N): 14.01 g/mol

* Hydrogen (H): 1.01 g/mol

* Phosphorus (P): 30.97 g/mol

* Oxygen (O): 16.00 g/mol

2. Calculate the Number of Atoms of Each Element:

* Nitrogen (N): 3 atoms

* Hydrogen (H): 12 atoms (3 x 4)

* Phosphorus (P): 1 atom

* Oxygen (O): 4 atoms

3. Multiply the Atomic Mass by the Number of Atoms:

* Nitrogen: 14.01 g/mol * 3 = 42.03 g/mol

* Hydrogen: 1.01 g/mol * 12 = 12.12 g/mol

* Phosphorus: 30.97 g/mol * 1 = 30.97 g/mol

* Oxygen: 16.00 g/mol * 4 = 64.00 g/mol

4. Add Up the Molar Masses of Each Element:

42.03 g/mol + 12.12 g/mol + 30.97 g/mol + 64.00 g/mol = 149.12 g/mol

Therefore, the molar mass of ammonium phosphate ((NH₄)₃PO₄) is 149.12 g/mol.