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A) Na2SO4
Masa cząsteczkowa czyli Mcz.
Mcz: 2*23u +32u+4*16u=46u+32u+64u=142u
Cp=ms/mr/*100%
Na =Cp=46/142/*100%=4600/142=32%
S=Cp=32/142/*100%=3200/142=22%
0=Cp=64/142/*100%=6400/142=45%
B) Pb(NO3)2
Mcz.207u+2*14u+5*16u=207u+28u+80u=315
Pb=Cp=207/315/*100%=20700/315=65%
N=Cp=28/315/*100%=2800/315=9%
O=Cp=8o/315/*100%=8000/315=25%