a) Zn(OH)2
PTK(Zn(OH)2 ) = NTK(Zn)+2. NTK(O)+2.NTK(H)= 65+2.16+2.1= 99(đ.v.C)
b) Fe(NO3)3
PTK(Fe(NO3)3= NTK(Fe)+ 3. NTK(N) + 3.3.NTK(O)= 56+ 3.14+9.16=242(đ.v.C)
c) Cl hóa trị I á em -> CTHH : NaCl
PTK(NaCl)= NTK(Na)+ NTK(Cl)= 23+35,5= 58,5(đ.v.C)
d) K2CO3
PTK(K2CO3)= NTK(K) .2 + NTK(C) + 3.NTK(O)= 2.39+ 12+3.16= 138(đ.v.C)
e) Fe2O3
PTK (Fe2O3)= 2.NTK(Fe)+3.NTK(O)= 2.56+3.16= 160(đ.v.C)
f) Zn(NO3)2
PTK(Zn(NO3)2)= NTK(Zn)+ 2. NTK(N)+3.2.NTK(O)= 65+2.14+6.16= 189(đ.v.C)