How many atoms are in in 13.2 mol copper?

1 Answer
anor277
Jun 27, 2016

13.2xxN_A" copper atoms", where N_A="Avogadro's number".

Explanation:

N_A="Avogadro's number"=6.022140857(74)xx10^23*mol^-1.

I may use N_A as I would use any other collective number: "dozens, Bakers' dozens, scores, gross, etc." Of course, N_A is an unfeasibly large number, and it happens that N_A ""^1H" atoms" have a mass of precisely 1*g. N_A is thus the link between the sub-micro world of atoms, and molecules, that which we can conceive of, and theorize about, and the macro world of "grams", and "litres", and "kilograms", that which we measure in a lab.

In an exam, would you have to remember N_A? The answer is no, as it will quoted to you as supplementary material. You do have to be able to manipulate it, and to demonstrate its significance.

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