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 $O_2$ consumed is________.

[Atomic weight in $gmo{l}^{-1}:O=16,S=32,Pb=207$]

Answer 1

$PbS+O_2\to Pb+S{O}_2$

No. moles of $Pb=$ no. of moles of $O_2$ $=\frac{1000}{32}mol$

$\therefore$ Mass of $Pb=\frac{1000}{32}\times 207g$

$=\frac{207}{32}kg=6.47kg$.