How is molar mass of a substance calculated?
A. Atomic mass of an element minus the number of atoms as indicated by chemical formula.

B. Number of atoms as indicated by chemical formula divided by atomic weight.

C. Atomic mass of an element multiplied by the number of each atom of each element as indicated by chemical formula then add all the products of all the elements.

D. Number of atoms as indicated by chemical formula divided by atomic mass of an element.​