Geoloski zadatak iz stehiometrije

Submitted by Srdjan on Mon, 01/12/2015 - 00:29
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Ruda galenit (PbS) sadrzi 40% jalovine.Koliko ce se dobiti olova przenjem 500kg te rude u prisustvu vazduha , a zatim redukcijom dobivenog oksida pomocu uglja?

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milicaradenkovic - Mon, 01/12/2015 - 09:19

PbS+vazduh---------------------->PbO

2PbO--------------------->2Pb+O2

Ako ima 40% jalovine onda ima 60% PbS.

m([PbS)=m(rude)*0.6=50*0.6=30 kg

n(PbS)=m(PbS)/Mr=30*10(3)/239=125.52 mol

n(PbO)=n(PbS)=125.52 mol

n(Pb)=n(PbO)=125.52 mol

m(Pb)=n(Pb)*Mr=207*125.52=25.98 kg