Galena (an ore) is partially oxidized by passing air through it at high temperatures. After some time, the passage of air is stopped, but the heating is continued in a closed furnace such that the contents undergo self-reduction. The weight (in kg) of Pb produced per kg of O2 consumed is ______. (Atomic weights in g mol-1 : O = 16, S = 32, Pb = 207)

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