(2) Let the mass of iron after the reaction be x 。
Iron+copper sulfate = copper+ferrous sulfate
56? 64
x？ 8 kg
5664=X8kg
X = 7 kg
The initial mass of the iron kettle is11.5 kg-8 kg+7 kg =10.5 kg; So it is 10.5.
(3)A is decomposed into three substances, and F is electrified to obtain two gases, indicating that F is water. When gas E enters the solution, a white precipitate is obtained, indicating that E is carbon dioxide. H is a blue precipitate, indicating that H is copper hydroxide. Therefore, D contains copper and can react with gas, indicating that D is copper oxide. From the above analysis, A is basic copper carbonate, which contains carbon, hydrogen, copper, oxygen and other elements.
Therefore, fill in: Cu, O, H, C Cu(OH)2.
Iron oxide reacts with hydrogen to produce iron and water, and iron reacts with sulfuric acid solution to produce light green ferrous sulfate solution.
Therefore, fill in: Fe+H2SO4 ═ FeSO4+H2 =