A análise elementar revelou que um composto apresenta C, H, N, e O como únicos constituintes. Uma amostra deste composto pesando 1, 279 gramas sofreu combustão total, 1,60 gramas de CO2 e 0,77 gramas de H2O. outra amostra desse mesmo composto, 1,625 gramas, continha 0,216 gramas de nitrogênio. Qual sua fórmula empírica?

Can someone me with 3 and 4 plz. this is for masteries test.

Ajet plane is speeding down the runway during takeoff. air resistance is not negligible. identify the forces on the jet.

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 .