Question

Calculate molecular mass of (NH4)2SO4.

Answer 1

The molecular mass of (NH4)2SO4
= 2×(14+4×1)+32+4×16
= 132 g/ mole

Answer 2

Molecular mass is the sum total of atomic masses of all molecules present in the compound

Mass of nitrogen= 14
Mass of hydrogen= 2
Mass of sulfur = 32
Mass of oxygen = 16

Now adding all the molecules present-

= 14 x 2 + 1 x 4 x 2 + 32 + 16 x 4
= 28 + 8 + 32 + 64
= 132 u