tính PTK: PTK NaOH PTK CuSO4 PTK K2CO3 PTK Fe2(SO4)3 PTK CuO PTK Fe2O3 PTK A1(NO3)3

`PTK_(NaOH)=NTK_(Na)+NTK_(O)+NKT_(H)=23+16+1=40(đvC)`
`PTK_(CuSO_4)= NTK_(Cu)+ NTK_(S)+4*NTK_(O)= 64+32+16*4=160(đvC)`
`PTK_{K_2CO_3}=NTK_K+NTK_C+NTK_O=2*39+12+3*16=138(đvC)`
`PTK_(Fe_2(SO_4)_3)=NTK_(Fe)+3NTK_(SO_4)=56*2+32*3+16*12=400(đvC)`
`PTK_(CuO)=PTK_(CuO)=NTK_(Fe)+3NTK_(SO_4)=56*2+32*3+16*12=400(đvC)`
`PTK_(Fe_2O_3)=NTK_(Fe)+NTK_O=56*2+16*3=160(đvC)`
`PTK_(Al(NO_3)_3)=NTK_(Al)+3NTK_(NO_3)=27+3(14+4*16)=261(đvC)`