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Question:

Galena (an ore) is partially oxidized by passing air through it at high temperature. 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 weight in g mol⁻¹: O=16, S=32, Pb=207]

Solution:

PbS + O2 → Pb + SO2
No. moles of Pb = no. of moles of O2 = 1000/32 mol
∴Mass of Pb = 1000/32 × 207 g = 207/32 kg = 6.47 kg.