Chemistry: The Molecular Science (5th Edition)

The molar mass of $K_2HPO_4$ is equal to 174.18g/mol.
Molar Mass ($K_2HP{O_4}$): $K:$ 39.1* 2 + $H:$ 1.01* 1 + $P:$ 30.97* 1 + $O:$ 16* 4 Adding these molar masses together gives: 174.18g/mol