The chief ore of Zn is the sulphide, ZnS. The ore is concentrated by froth floatation process and then heated in air to convert ZnS to ZnO.
2ZnS+3O2→2ZnO+2SO2 (75% conversion)
ZnO+H2SO4→ZnSO4+H2O (100% conversion )
2ZnSO4+2H2O→2Zn+2H2SO4+O2 (80% conversion)
The mass of
Zn obtained from a sample of ore containing
292.2 kg of
ZnS will be :