Câu 1:
a, $Fe+S\buildrel{{t^o}}\over\to FeS$
b, $2Fe+3Cl_2\buildrel{{t^o}}\over\to 2FeCl_3$
c, $2Mg+O_2\buildrel{{t^o}}\over\to 2MgO$
d, $Cl_2+H_2\buildrel{{t^o}}\over\to 2HCl$
e, $MnO_2+4HCl\to MnCl_2+Cl_2+2H_2O$
Câu 2:
a,
$Mg+2HCl\to MgCl_2+H_2$
b,
$n_{Mg}=\dfrac{7,2}{24}=0,3(mol)$
$\Rightarrow n_{HCl}=2n_{Mg}=0,6(mol)$
$V_{HCl}=\dfrac{0,6}{1}=0,6l$
c,
$n_{MgCl_2}=n_{Mg}=0,3(mol)$
$\Rightarrow C_{M_{MgCl_2}}=\dfrac{0,3}{0,6}=0,5M$
