Answer :
[tex]▪▪▪▪▪▪▪▪▪▪▪▪▪ {\huge\mathfrak{Answer}}▪▪▪▪▪▪▪▪▪▪▪▪▪▪[/tex]
Compound ~ [tex] \mathrm{NaOH}[/tex]
Na = 1
O = 1
H = 1
Compound ~ [tex] \mathrm{CO_2}[/tex]
C = 1
O = 2
Compound ~ [tex] \mathrm{3 \: CaO}[/tex]
Ca = 3
O = 3
Compound ~ [tex] \mathrm{2 MgCl_2}[/tex]
Mg = 2
Cl = 4