How many atoms are in 2.5 moles of nickel?

1 Answer
anor277
Apr 23, 2018

Well, how many atoms are there in one mole of any element...?

Explanation:

...there are #6.022xx10^23# such atoms....where #6.022xx10^23# is the so-called #"Avogadro number"#, the which is typically written as #6.022xx10^23*mol^-1#.

Why should we use such an absurdly large number? Well, should we have #6.022xx10^23# #""^1H# atoms we would have a mass of #1*g# of hydrogen...precisely. The mole is thus the link between the micro world of atoms, and molecules, to the macro world of grams and litres.

And so we gots the product...

#2.5*molxx6.022xx10^23*mol^-1=15.06xx10^24*"nickel atoms"#.

And given that nickel has a molar mass of #58.7*g*mol^-1# (how did I know this?)...can you tell us the mass of the given quantity of nickel?

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