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MHT CET Medical202626 April 2026Morning ShiftChemistrySome Basic Concepts of ChemistryActual

A coordination complex contains 2.6 % of Mg. Find the number of Mg atoms in 5.0 g of this sample. (gram atomic mass of Mg = 24 g )

Options

  1. A1.5 10²¹
  2. B3.26 10²¹
  3. C2.82 10²¹
  4. D4.3 10²¹

Correct answer

B. 3.26 10²¹

Step-by-step solution

Mass of the sample = 5.0 g Percentage of Mg in the complex = 2.6 % Mass of Mg in the sample = 2.6 100 5.0 = 0.13 g Number of moles of Mg = 0.13 24 mol Number of Mg atoms = 0.13 24 6.022 10²³ Number of Mg atoms = 3.26 10²¹ Answer: 3.26 10²¹

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