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Obtaining Zinc Oxide from Calamine
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| Submitted: Fri Sep 05 2003
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Obtaining Zinc Oxide from Calamine Introduction Calamine is a mineral containing zinc carbonate (ZnCO3) On heating it decomposes as: ZnCO3 ZnO + CO2 (C = 12, 0 = 16, Zn = 65) This equation allows you to calculate a theoretical conversion of calamine into zinc oxide. As when using the theoretical conversion; ZnCO3 ZnO + CO2 65+12+48 65+16 + 12+32 125 81 + 44 This means that one mole of calamine weighs 125g and when heated it produces 81g of zinc oxide and 44g of carbon dioxide. Therefore to work out how much zinc oxide is produced from 1g of calamine we divide 81 by 125. 81/125 = 0.648g To calculate how much zinc oxide is produced from 2g of calamine 0.648 is doubled: 0.648 x 2 = 1.296g To calculate how much zinc oxide is produced from 3g of calamine 0.648 is tripled and so on when increasing the mass of calamine. On the next...
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