If you inhale 1000 cm³ of air with one breath about 200 cm³ would be oxygen. the rest is mostly nitrogen, one molecule of oxygen is about 0.00000000000000000004 cubic centimeters in volume, about how many molecules of oxygen did you just inhale?

Inside a flashbulb, oxygen surrounds a thin coil of magnesium. when the flashbulb is set off, a chemical reaction takes place in which magnesium combines with oxygen to form magnesium oxide. which of the chemical equations matches the reaction above? a. mg + o2 mgo2 + energy b. 2mg + o mg2o + energy c. 2mg + o2 2mgo + energy d. mg + o mgo + energy