Final answer:
The molar mass of (NH4)2S is 68.09 g/mol.
Step-by-step explanation:
The molar mass of (NH4)2S can be calculated by adding up the atomic masses of each element in the compound.
The molar mass of NH4 is 14.01 g/mol (from N = 14.01 g/mol and H = 1.01 g/mol, multiplied by 4 because there are 4 hydrogen atoms).
The molar mass of S is 32.07 g/mol.
Therefore, the molar mass of (NH4)2S is (14.01 g/mol + 14.01 g/mol) + 32.07 g/mol = 68.09 g/mol.