Question

a specimen of hematite contains 20 percent Fe₂o₃ .what weight of iron can be obtained from 1000 kg of hematite

Answer 1

$$\begin{gathered} MolecularmassofF{e}_2{O}_3=2\times 56+3\times 16=160g \\ Theorecontains20\%ofF{e}_2{O}_3 \\ SothemassofF{e}_2{O}_{3}inthegivensampleofhematite1000kg=200g \\ Mass\%ofironinF{e}_2{O}_3=\frac{2\times 56}{160}\times 100=70\% \\ So70\%of200gofF{e}_2{O}_3=\frac{70}{100}\times 200=140gofiron \end{gathered}$$