In: Chemistry
lead (2) sulfide is the principle source of lead metal. to obtain the metal, the sulfide is first heated in air to produce pbo.
PbS+3/2O2------------>PbO+
SO2
H= - 415.4 kj ------------> 1
PbO + C-----------> Pb +
CO
H=108.5 KJ -------------> 2
Adding two equations
PbS+3/2O2------------>PbO+
SO2
H= - 415.4 kj ------------> 1
PbO + C-----------> Pb +
CO
H=108.5 KJ -------------> 2
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PbS + 3/2O2 + C --------> Pb + SO2 + CO
H = -306.9KJ >>>>answer