This document contains 8 chemistry problems involving calculations with solutions, normality, concentrations, and chemical reactions. Problem 1 involves the reaction of zinc with hydrochloric acid to produce hydrogen gas, which is then used to reduce iron(III) oxide to iron. Problem 2 gives data for a 1 M methanol solution in water and asks for molar fraction, mass percent, and molality calculations. Problem 3 deals with a reaction between hydrogen peroxide and potassium permanganate solutions to produce oxygen gas.