Pt : 2A + 3Cl2 -> 2ACl3
0,04 <- 0,06 /mol
\(m_{Cl2}=m_{Al2Cl3}-m_A=6,5-2,24=4,26\) (g)
\(n_{Cl2}=\frac{4,26}{71}=0,06\left(mol\right)\)
\(M_A=\frac{2,24}{0,04}=56\)
=> A là Fe
\(2A+xCl2-->2AClx\)
\(m_{Cl2}=m_{AClx}-m_A=6,5-2,24=4,62\left(g\right)\)
\(n_{Cl2}=\frac{4,62}{71}=0,06\left(mol\right)\)
\(n_A=\frac{2}{x}n_{Cl2}=\frac{0,12}{x}\left(mol\right)\)
\(M_A=2,24:\frac{0,12}{x}=18,667x\)
\(x=3\Rightarrow M_A=56\left(Fe\right)\)
Vậy A là Fe