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OpenStudy (anonymous):
A sample of ZnS is nearly 90% pure what percentage of Zink does it contains?
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OpenStudy (joppei):
I am too lazy to go look for molacular weights but you have to determine the weight percentage of zink in ZnS which you do as following: \[(Molecular weight of Zinc)/(Molecular weightof (Zns) * 100\] Then you multiply this number with 0,9 (the 90% from the purity)
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