Bài 1:
$3Fe+2O_2\buildrel{{t^o}}\over\to Fe_3O_4$
$2Al+6HCl\to 2AlCl_3+3H_2$
$4P+5O_2\buildrel{{t^o}}\over\to 2P_2O_5$
$2Al(OH)_3\buildrel{{t^o}}\over\to Al_2O_3+3H_2O$
$4Al+3O_2\buildrel{{t^o}}\over\to 2Al_2O_3$
$Fe+2HCl\to FeCl_2+H_2$
Bài 3:
a,
$Fe+H_2SO_4\to FeSO_4+H_2$
$CuO+H_2\buildrel{{t^o}}\over\to Cu+H_2O$
b,
$n_{Fe}=\frac{5,6}{56}=0,1 mol$
$\Rightarrow n_{H_2}=n_{Fe}=0,1 mol$
$V_{H_2}=0,1.22,4=2,24l$
c,
$n_{Cu}=n_{H_2}=0,1 mol$
$\Rightarrow m_{Cu}=0,1.64=6,4g$
Bài 4:
$2Na+2H_2O\to 2NaOH+H_2$
$n_{Na}=\frac{46}{23}=2 mol$
$\Rightarrow n_{NaOH}=2 mol$
$C_M=\frac{2}{0,4}=5M$
