CBSE Class 11-science Answered
Main ore of zinc is zinc blende . The ore is concentrated by froth floatation process and then heated to air to convert ZnS to ZnO , considering the following equations( refer image attached). Calculate the number of moles of ZnS required to produce 2 moles of Zn ?
Asked by arunavamitra50 | 19 Aug, 2018, 08:42: PM
Expert Answer
1. 2Zn + 3O2 → 2ZnO + 2SO2
no. of moles 2 1.6 (80%)
2. ZnO + H2SO4 → ZnSO4 + H2O
no. of moles 1.6 1.6(100%)
3. 2ZnSO4 + 2H2O → 2Zn
no. of moles 1.6 1.28(80%)
From the above data its clear that
for 1.28 moles of Zn required ZnO = 2
so, for 2 moles of Zn, ZnO required = 2×2/1.28 = 3.125moles.
Answered by Sumit Chakrapani | 22 Aug, 2018, 01:49: AM
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