Question

Answer 1

Bài 2:

\(1,Zn+H_2SO_4\rightarrow ZnSO_4+H_2\\ ....1.....1......1......1\\ 2,Fe+CuO\rightarrow^{t^o}FeO+Cu\\ ....1......1.....1.....1\\ 3,CuO+H_2\rightarrow^{t^o}Cu+H_2O\\ ....1.....1.....1......1\\ 4,Mg\left(OH\right)_2+2HCl\rightarrow MgCl_2+2H_2O\\ ....1.....2.....1.....2\\ 5,Ca+2H_2O\rightarrow Ca\left(OH\right)_2+H_2\\ ....1.....2.....1.....1\\ 6,H_2+Cl_2\rightarrow^{t^o}2HCl\\ ....1....1.....2\)

Answer 2

Bài 1:

\(PTHH:3Fe+2O_2\rightarrow Fe_3O_4\)

Bảo toàn KL: \(m_{Fe}=m_{Fe_3O_4}-m_{O_2}=48-21=27\left(g\right)\)