Molecular weight of a substance is calculated by adding atomic weight of each atom in that substance or molecule.
How to calculate the molecular weight for the given molecule : AgS2O3
The atoms in the given molecule are: Ag,S,O
Find the atomic weight for the given chemical elements. Ag = 107.8682S=32.065O=15.9994 Here in the given molecule we have 1 part of Ag 2 parts of S 3 parts of O Therefore, atomic weight of S should be multiplied by 2 and atomic weight of O should be multiplied by 3 as shown below: AgS2O3 = 107.8682+(32.065*2)+(15.9994*3) AgS2O3 = 107.8682+64.13+47.9982 AgS2O3 = 219.9964