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JEE MainChemistrySome Basic Concepts of Chemistry

Consider the following thermally induced displacement reaction (Thermite process): 2 Al(s) + Fe ₂ O ₃ (s) Al ₂ O ₃ (s) + 2 Fe(l) If 54 g of aluminium ( Al ) reacts completely with excess iron(III) oxide, the mass of iron ( Fe ) produced is (Given: Atomic masses of Al , O and Fe are 27, 16 and 56 , respectively.)

Options

  1. A54 g
  2. B56 g
  3. C112 g
  4. D224 g

Correct answer

C. 112 g

Step-by-step solution

The balanced chemical equation is: 2 Al(s) + Fe ₂ O ₃ (s) Al ₂ O ₃ (s) + 2 Fe(l) Number of moles of Al reacted = 54 27 = 2 mol From the stoichiometry of the reaction, 2 moles of Al produce 2 moles of Fe . Therefore, the number of moles of Fe produced = 2 mol Mass of Fe produced = moles molar mass = 2 56 = 112 g . Answer: 112 g

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