Lesson eLearning

In a 4.00 g sample of the complex ‛[Fe(NH3)6]Cl3”, what is the mass of iron present?

medium 2 marks Class 11 · Biology · Chemical Coordination and Integration
Answer
0.846 g

The correct answer is 0.846 g — Answer: 0.846 g.

Step-by-step solution

  1. Calculate molar mass of the complex: Fe (55.85) + 6·NH3 (6·17.03) + 3·Cl (3·35.45) = 264.2 g/mol.
  2. Find the number of moles of complex in 4.00 g: 4.00 g ÷ 264.2 g/mol = 0.01515 mol.
  3. Multiply by the molar mass of Fe to find mass of Fe: 0.01515 mol × 55.85 g/mol = 0.846 g.
  4. Answer: 0.846 g.
Common mistake: Using incorrect molar mass for NH3

Concept tested: Mole–mass calculation for coordination complex

Published · How this solution was prepared and checked

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