Question

what is moleecular mass of alum

Answer 1

molecular mass of alum is 474.3884

Answer 2

heya friend

molecular mass of an atom is the sum of atomic masses of constituent atoms

for example,
in a single molecule of H2O
the atomic mass of hydrogen is1 and oxygen is 16
molecule has2 hydrogen atom and single oxygen atom
so molecular mass of water is2+16=18

hope it helps you