Answer:
Molecular mass is a measure of the mass of a molecule in atomic mass units, or amus. The molecular mass of a molecule is the sum of all the atomic masses for each element in the molecule. Calcium carbonate contains one molecule of calcium, one molecule of carbon and 3 molecules of oxygen CaCO3
Mass of Calcium = 40
Mass of Carbon = 1
Mass of Oxygen = 16
=1×40+1×12+3×16
=40+12+48
=100g⋅mol−1
