Answer:96.03 g/mol.
Step-by-step explanation:
The molar mass of H2PO4- is calculated by adding up the atomic masses of all the atoms in the compound.
H2PO4-: 2(1.008) + 1(30.97) + 4(16.00) = 96.03 g/mol
Therefore, the molar mass of H2PO4- is 96.03 g/mol.