Lead (11) sulphide, PbS , can be converted to lead metal in two reaction steps Step 1: 2PbS (s) + 3O 2 (g) > 2PbO (s) + 2 SO 2 (g) Yield 65% Step 2: 2PbO (s) +C (s) > Pb (s) + CO (g) Yiled 75% 2g Pb...

Lead (11) sulphide, PbS , can be converted to lead metal in two reaction steps

Step 1: 2PbS
_(s)+ 3O_2
(g)
> 2PbO
_(s)
+ 2 SO_2
(g)  Yield 65%

Step 2: 2PbO
_(s)
+C
_(s)
> Pb_(s)
+ CO
_(g)  Yiled 75%

2g Pb is collected and found to be 95% pure (by mass) as it is contaminated with carbon

1.What mass of pure PbS was used , given that excess amounts of both oxygen and carbon are added