a. $CH_{x}$ + $[1/2(1/2x+y)]O_{2}$ → $CO_{2}$ + $1/2xH_{2}O$
b. $2FeCl_{x}$ + $(3 - x)Cl_{2}$ → $2FeCl_{3}$
c. $4CO_{ }$ + $2(x - 1)SO_{2}$ → $4CO_{x}$ + $2(x - 1)S_{ }↓$
d. BÓ TAY
e. $Al_{2}(SO_{4})_{3}$ + $6NaOH_{ }$ → $Al(OH)_{3}$ + $3Na_{2}SO_{4}$