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→80%2ZnO+2SO2ZnO+H2SO4→100%ZnSO4+H2O2ZnSO4+2H2O→80%2Zn+2H2SO4 The number of moles of ZnS required for producing 2 moles of Zn will be

Apply PO AC for Zn l×moles of ZnS=l×mol ZnMoles of ZnS =20.8×0.8×1=3.125mole

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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.
$2 Z n S + 3 O_{2} \overset{80 %}{\to} 2 Z n O + 2 S O_{2}$
$Z n O + H_{2} S O_{4} \overset{100 %}{\to} Z n S O_{4} + H_{2} O$
$2 Z n S O_{4} + 2 H_{2} O \overset{80 %}{\to} 2 Z n + 2 H_{2} S O_{4}$
The number of moles of ZnS required for producing 2 moles of Zn will be

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Apply PO AC for Zn
$l \times moles of ZnS = l \times mol Zn$
Moles of ZnS $= \frac{2}{0.8 \times 0.8 \times 1} = 3.125 m o l e$

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