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Stoichiometric Calculations

Calculate the...

Question

Calculate the weight of Iron which will be converted into its oxide by the action of 18 g of steam.
Given the reaction :
$3 F e + 4 H_{2} O \to F e_{3} O_{4} + 4 H_{2}$
(Atomic mass of $F e = 56 g$ ).

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Solution

The balanced equation is
$3 F e + 4 H_{2} O \to F e_{3} O_{4} + 4 H_{2}$
$Moles of steam = \frac{mass}{Molar mass} = \frac{18}{18} = 1 mole$
$Moles of Fe = \frac{3}{4} \times moles of H_{2} O = \frac{3}{4} \times 1.0 = 0.75$
$Mass of Fe = mole \times molar mass$
$= 0.75 \times 56 = 42 g$

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