Wait, how did you know the %Ni?
I'm gonna gues, but if you would correct me..
You know the number of moles, therefore the mass of Ni = moles x Ar of Ni
Then %Ni = (mass of Ni/mass of total complex made) x 100
We then have to work out the relative molecular mass using the %Ni. Thing is I've reached a value for the Mr, but via a different method! I knew the no. of moles in 20cm3, so i know how many moles are in the 200cm3 standard solution me made, using 0.31g of the complex. Therefore I worked out Mr of the complex by Mr = mass used/moles
How do I work out the Mr from the %Ni?