Galena is the ore from which elemental lead is extracted. In the first step of the extraction process, galena is heated in air to form lead(II) oxide.
2PbS(s) + 3O2(g) �� 2PbO(s) + 2SO2(g) ?H = -827.4kJ
What mass of galena is converted to lead(II) oxide if 975 kJ of heat are liberated?
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