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a) 207+16=223g
223g---100%
16g----x% x=7,73 % , wiec odpada
b)PbO2=239g
239g---100%
16g---x% x=6,69%, odpada
c)Pb2O3=2*207+3*16=462g
462g--100%
48g---x x=10,39%
d)Pb3O4=685g
685g-100%
64g---x x=9,34% pasuje, wiec d