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?

Related questions
See all questions in The Mole
Impact of this question
1542 views around the world
You can reuse this answer
Creative Commons License