Solid boron can be extracted from solid boron oxide by retain with magnesium metal at high temperature. A second product is solid magnesium oxide. a) write the balanced equation for the reaction. b) what mass of boron can be produced when 125 kg of boron oxide is heated with 125 kg of magnesium? c) if 31.4 kg of solid boron is produced in a reaction, what is the percentage yield of boron?