Hello!
To know how many moles of iron can be recovered from 100 kg of Fe₃O₄ we'll need to use the
molar mass of Fe₃O₄ and apply the conversion factor to go from kg of Fe₃O₄ to moles of Fe in the following way:

So, theoretically, one could recover
1192,68 moles of Fe from 100 kg of Fe₃O₄
Have a nice day!
Answer:
762.60 g
Explanation:
In order to convert from moles of a substance into grams, we need to multiply the number of moles by the substance's molar mass:
- Moles * Molar Mass = Grams
With the above information in mind, we can <em>use the data given by the problem</em> and <u>calculate how many grams are there in 12 moles of Cu</u>:
- 12 mol * 63.55 g/mol = 762.60 g
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