Question

roasting galena [lead (II)] is an early step in the industurial isolation of lead. How many liters of sulfur dioxide, measured at STP, are produced by the reaction of 9.11 kg of galena with 114 L of oxygen gas at 220 degree C and 2.00 atm? Lead(II) oxide also forms.

LSO2

Answer 1

T = 220 + 273 = 493 K

P = 2.00 atm

V = 114 L

P V = n R T

n = 2 x 114 / 0.0821 x 493

n = 5.63

moles of O2 = 5.63

moles of PbS = 9.11 x1000 / 239.2 = 38.1

2 PbS + 3 O2 ----------------------> 2 PbO + 2 SO2

2                3                                                  2

38.1           5.63

limiting reagent is O2

moles of SO2 formed = 5.63 x 2 / 3 = 3.75

volume = n R T / P

             = 3.75 x 0.0821 x 273 / 1

            = 84.1 L

volume of SO2 formed = 84.1 L