Ruda

Milja95's picture

Mlevena ruda sadrzi: 50g PbS,28g kvarcnog peska,20g kvarcnog krecnjaka,i 12g gline.Koliko se grama olova nalazi u 45g ove smese?

milicaradenkovic's picture

n(PbS)=m/Mr=50/240=0.2083 mol

PbS---------------->Pb2+ + S2-

n(Pb)=n(PbS)=0.2083 mol

mu=m(PbS)+m(kvarcnog peska)+m(gline)+m(kvarcnog krecnjaka)=12+28+50+20=110 g

m(Pb)=n(Pb)*Mr=0.2083*208=43.326 g

43.326 g----------------------------110 g

x g------------------------------------------45 g

x=43.326*45/110=17.72 g Pb