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One useful method for recycling scrap aluminum converts some of it to common alum [potassium aluminum sulfate dodecahydrate, KAl(SO4)212 H2O], an important dye fixative and food preservative. 4 significant figures.

(a) How many moles of potassium ions are in 356 g alum?

(b) What is the mass % S in alum (to 3 significant figures)?

(c) What is the maximum amount of alum (in metric tons) that can be prepared from 24.3 metric tons of scrap aluminum (1 metric ton = 1000 kg)?

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Category:- Chemistry
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