L'énoncé
Question 1
$C_4H_{10} + O_2 \to CO_2 + H_2O$
$2C_4H_{10} + 13O_2 \to 8CO_2 + 10H_2O$
Question 2
$Fe + 0_2 \to Fe_3O_4$
$3Fe + 2 0_2 \to Fe_3O_4$
Question 3
$ CH_4 + H_2O \to CO + H_2$
$ CH_4 + H_2O \to CO + 3H_2$
Question 4
$Pb_3O_4 + Mg \to MgO +Pb$
$Pb_3O_4 + 4Mg \to 4MgO +3Pb$
Question 5
$K + O_2 \to K_2O$
$4K + O_2 \to 2K_2O$
Question 6
$Fe^{2+} + CN^- \to Fe(CN)_6^{4-}$
$Fe^{2+} + 6CN^- \to Fe(CN)_6^{4-}$