What mass in grams of nitric acid is required to react with 750 g C7H8?

Can someone me with questions 15 to 17 plz.

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)

Chortling is used to clean water. another possible atom that would also work is a. sodium b. sulfur c. bromine