The composition of air by volume is approximately 1/5 oxygen, 4/5 nitrogen. when
air is passed through red-hot carbon, the following reaction occurs: 2c + o2(g)
2co(g). if all of the oxygen is converted to carbon monoxide, what is the
composition, by volume, of the gas produced?
(a)1/5 carbon monoxide, 4/5 nitrogen
(b) 1/3 carbon monoxide, 2/3 nitrogen
(c) 2/5 carbon monoxide, 3/5 nitrogen
(d)1/2 carbon monoxide, 1/2 nitrogen

One way in which the useful metal copper is produced is by dissolving the mineral azurite, which contains copper(ii) carbonate, in concentrated sulfuric acid. the sulfuric acid reacts with the copper(ii) carbonate to produce a blue solution of copper(ii) sulfate. scrap iron is then added to this solution, and pure copper metal precipitates out because of the following chemical reaction: (s) (aq) (s) (aq) suppose an industrial quality-control chemist analyzes a sample from a copper processing plant in the following way. he adds powdered iron to a copper(ii) sulfate sample from the plant until no more copper will precipitate. he then washes, dries, and weighs the precipitate, and finds that it has a mass of .