Define formula unit mass

Define formula unit mass. How is it calculated? Write the formula unit mass of (NH4)2S04. [Given atomic mass: N = 14 u, H= 1 u,S = 32 U.O = 16 u].

Formula unit mass is the sum of the atomic masses of all atoms present in a formula unit of a compound. It is calculated by adding the atomic masses of all the atoms present in one formula unit. Formula unit mass of
(NH4)2so4 = 14x2 + 4x2 + 32 + 16x4 = 132 u.