\(n_{HCl}=\dfrac{50.21,9\%}{36,5}=0,3\left(mol\right)\)
PTHH: X + 2HCl --> XCl2 + H2
0,15<--0,3
=> \(M_X=\dfrac{3,6}{0,15}=24\left(g/mol\right)\)
=> X là Mg
\(m_{HCl}=\dfrac{50.21,9}{100}=10,95g\\
n_{HCl}=\dfrac{10,95}{36,5}=0,3\left(mol\right)\\
pthh:X+2HCl\rightarrow XCl_2+H_2\)
0,15 0,3
\(M_X=\dfrac{3,6}{0,15}=24\left(\dfrac{g}{mol}\right)\)
=> X là Mg