Please help me with these problems

Use examples from the article to explain one positive and one negative effect that chemistry has had on society.

Iron (fe) reacts with copper sulfate (cuso4) to form iron (ii) sulfate. in this reaction, cu2+ gains electrons to form cu. which statement is true about this reaction? fe(s) + cuso4(aq) → feso4(aq) + cu(s)

The molar mass of nickel(ni) is 58.7 g/mol. how many moles are in an 88 gram sample of nickel?