Determine the number of moles in each of the following?

Question

(A) 4.00 x 10^20 atoms lead

(B) 1.49 x 10^23 formula units sodium hydroxide

(C) 1.17 x 10^25 copper(II) ions

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Answer 1 · 2018-01-27T19:00:46

Well...one mole specifies..#6.022xx10^23# #"individual particles"#

And so far (a) we gots a molar quantity of....

#(4.00xx10^20" lead atoms")/(6.022xx10^23*"lead atoms"*mol^-1)=6.64xx10xx10^-4*mol#...

What is the mass of this molar quantity...?

We see increasing molar quantities of (b) sodium hydroxide, and (c) copper(II) ions, but I will let you address these...