Impurified nickel can be purified by first forming the compound Ni2(SO4)3, which is then decomposed by heating to yield very pure nickel. Metallic nickel reacts directly with concentrated sulfuric acid according to this equation:
2Ni + 3H2SO4 yields Ni2(SO4)3 + H2
Other metals present do not react. If 94.2g of a metal mixture produces 98.4g Ni2(SO4)3, what is the mass percent of nickel in the original sample?