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QUESTION

# The molar mass of calcium chloride (CaCl2) represents the mass of one mole of what?

Represents the mass of one mole of calcium chloride, which is 110.98*g.

The molar mass is the mass of "Avogadro's number" of particles, where "Avogadro's number "=6.022xx10^23*mol^-1, and is abbreviated as N_A.

Thus in one mole of calcium we have N_A calcium atoms (well calcium ions, but these are really equivalent!) and 2xxN_A chlorine atoms.

Why do we use N_A and concept?

Well it enables us to equate the macro world of grams and kilograms, what we measure on a balance, with the submicro world of atoms and molecules, of which we can conceive, but cannot observe directly. The concept of molar equivalence is central to the study of chemistry. If you know the formula, and you know the mass of the stuff, use of N_A allows you to measure very precisely the number of atoms and molecules in a process.