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  3. Chemistry
  4. The weight of iron which will be converted into its oxide ( Fe 3 O 4) by the action of 18 g of steam on it will be (At. wt. of Fe =56 )

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Q. The weight of iron which will be converted into its oxide $\left( Fe _{3} O _{4}\right)$ by the action of $18\, g$ of steam on it will be (At. wt. of $Fe =56$ )

AIIMSAIIMS 2011

Solution:

$\underset{3 \times 56\, g}{3 Fe} +\underset{4 \times 18\, g}{4 H _{2} O} \longrightarrow Fe _{3} O _{4}+4 H _{2}$
$4 \times 18\, g\, H _{2} O \equiv 3 \times 56\,g\, Fe$
$\therefore 18\, g\, H _{2} O \equiv \frac{3 \times 56}{4}$
$\equiv 42\, g$