Em tham khảo!
$\text{Kali Cacbonat: K2CO3}$
$\rightarrow$ $\text{K=39}$
$\rightarrow$ $\text{C=12}$
$\rightarrow$ $\text{O=16}$
$\leftrightarrow$ $\text{K2CO3=(39.2)+12+(16.3)= 138}$
$\rightarrow$ $\text{3 K2CO3=138.3=414}$
$\leftrightarrow$ $\text{Chon D) 414}$
#TRANPHAMGIABAO