Calculate the mass fractions of all elements in the dolomite molecule.

CaMg (CO3) 2 – dolomite

Mr (CaMg (CO3) 2) = 40 + 24 + 12 * 2 + 16 * 6 = 40 + 24 + 24 + 96 = 184.

Let’s find the mass fractions of elements in the dolomite molecule.

We multiply the number of atoms of an element by the relative atomic mass of the element (Ar) and divide this product by the relative molecular mass of the substance (Mr).

ω (Ca) = 1 * 40/184 = 0.22 = 22%;

ω (Mg) = 1 * 24/184 = 0.13 = 13%;

ω (C) = 2 * 12/184 = 0.13 = 13%;

ω (O) = 6 * 16/184 = 0.52 = 52%.