\(Cu+X2-->CuX2\)
\(n_{Cu}=\frac{13,44}{64}=0,21\left(mol\right)\)
\(n_{X2}=n_{Cu}=0,21\left(mol\right)\)
\(M_{X2}=\frac{33,6}{0,21}=160\)
\(=>X=80\left(Br\right)\)
Vậy......
Câu 6
\(2Na+X2-->2NaX\)
\(m_{X2}=m_{muối}-m_{Na}=9-1,38=7,62\)
\(n_{Na}=\frac{1,38}{23}=0,06\left(mol\right)\)
\(n_{X2}=\frac{1}{2}n_{Na}=0,03\left(mol\right)\)
\(M_{X2}=\frac{7,62}{0,03}=245=>X=127\left(I\right)\)
bài 5
Cu+X2--->CuX2
0,21--0,21 mol
nCu=13,44\64=0,21(mol)
nX2=nCu=0,21(mol)
MX2=33,6\0,21=160
-->X=80(Brom)
Câu 6
2Na+X2−−>2NaX
0,06---0,03 mol
mX2=mmuối−mNa
->mX2=9−1,38=7,62
nNa=1,38\23=0,06(mol)
MX2=7,62\0,03=245
-->X=127(Iôt)