+NaCl
%m Na=23/58,5.100%=39,32%
%m Cl=100%-39,32=60,68%
+FeCl2
%m Fe=56/127.100%=44,09%
%m Cl=100%-44,09=55,91%
+CuSO4
%m Cu=64/160.100%=40%
%m S=32/160.100%=20%
%m O=100%-40%-20%
=40%
+K2CO3
%m K=78/138.100%=56,52%
%m C=12/138.100%=8,7%
%m O=100%-8,7%-56,52%=34,78%