How many atoms in 18*mol of water?

1 Answer
anor277
Apr 24, 2017

54xxN_A, where N_A-="Avogadro's Number................."

Explanation:

By definition a mole of stuff SPECIFIES 6.022xx10^23 individual items of that stuff. Why should we use such an absurdly large number? Well, it turns out that 6.022xx10^23 individual ""^1H atoms have a mass of 1.00*g precisely. The mole is thus the link between the submicro world of atoms and molecules, to the macro world of grams, kilograms, and litres.

We also conveniently use the symbol N_A, where N_A-=6.022xx10^23. And we can use the "mole" as we would any other collective number, i.e. "dozen", "Bakers' dozen", "score", "gross......"

And so we have 18*mol of H_2O, which is equivalent to 3xx18xx6.022xx10^23 individual atoms. What is the mass of this quantity of given atoms?

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