Question

How many GRAMS of Ni2+ are present in 3.17 moles of nickel(II) iodide

Answer 1

Amount of Ni ions is 3.17 moles. The molar mass of Ni is 58.7 g/mol. The mass of
Ni is
m(Ni) = n(Ni) * M(Ni) = 3.17 mol * 58.7 g/mol = 186.08 g.