Molecular weight is nothing but the weight of atoms in a molecule. Each element has its own mass but distinct weight that depends on number of atoms present in it. Hence molecular weight is the sum of mass of the constituent atom multiplied by the number of atoms present in the element.

Molecular weight formula is given by

Molecular weight formula is given by

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Fe

Mass of Fe = 55.847 amu,

Mass of O = 15.9994 amu

Molecular weight of Fe

= 2 $\times$ 55.847 amu + 3 $\times$ 15.9994 amu

= 159.692 amu.

K

Molecular mass of K = 39.098 amu,

Molecular mass of s = 32.066 amu,

Molecular mass of o = 16.999 amu

Molecular weight of K

= 2 $\times$ 39.098 amu + 1 $\times$ 32.066 amu + 4 $\times$ 16.999 amu

= 174.298 amu