How many moles of nickel (ni) atoms are in 125 g ni?

The solution to the problem is as follows:

125/58.69 = 2.12 mol 

Therefore, there are 2.12 moles of nickel (Ni) atoms are in 125 g Ni.

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(no3)⁻n has oxidation number x,o has oxidation number -2.(x*1 -2*3) charge of the nitrate ion, and we know that charge of the nitrate ion =-1.so,(x*1 -2*3) =-1x-6=-1x=+5answer a. +5.