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hoon

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  1. please guide,how can i derive 0.28% cu from cuso4? as i know molecular weight of cuso4 is 159 and % of cu is 39.62, but how rest sulfur would be excluded ?as sulfur is not required in the composition and likewise how will exclude nitrate after taking cobalt from cobalt nitrate? and phospate after taking potash from potassium-phosphate.
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