The mass of a single nickel atom is 9.75×10-23 grams. How many nickel atoms would there be in 220 milligrams of nickel

Question

I do not know how to do this problem. I really need it solved and worked out so I know how to do it myself and for the future. Thank you.

Answer 1

Kaitlyn,

            Since 220 milligrams = .22 grams the number N, we are looking for is 9.75x10^-23*N=.22, solving for N gives

N=2.2256...*10²¹    many many Ni atoms.

 

Jim