Đề 2.
Trắc nghiệm: 1A, 2B,3B,4B,5D,6A
Tự luận:
Câu 1.
\(4Na+O_2\underrightarrow{t^o}2Na_2O\)
\(Na_2O+H_2O\rightarrow2NaOH\)
\(2NaOH+SO_2\rightarrow Na_2SO_3+H_2O\)
\(Na_2SO_3+H_2SO_4\rightarrow Na_2SO_4+H_2O+SO_2\)
Câu 2.
\(n_{H_2}=\dfrac{0,56}{22,4}=0,025mol\)
\(Mg+2HCl\rightarrow MgCl_2+H_2\)
0,025 0,05 0,025 0,025
\(m_{HCl}=0,05\cdot36,5=1,825\left(g\right)\)
\(m_{ddHCl}=\dfrac{1,825}{14,6}\cdot100=12,5\left(g\right)\)