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MHT CET20255 May 2025Evening ShiftChemistrySome Basic Concepts of ChemistryActual

What is the number of hydrogen atoms present in 5.4 g of urea?

Options

  1. A9.011 10²³
  2. B6.022 10²³
  3. C2.168 10²³
  4. D3.011 10²³

Correct answer

C. 2.168 10²³

Step-by-step solution

Number of hydrogen atoms in 5.4 g of urea Urea has the formula CO(NH₂ )₂ , with a molar mass of approximately 60 g/mol (simplified from 60.062 g/mol for calculation). In one molecule, there are 4 hydrogen atoms. The number of moles in 5.4 g is n = 5.4 60 = 0.09 mol. Using Avogadro's number, N_ A = 6.022 10²³ , the number of hydrogen atoms is 0.09 6.022 10²³ 4 = 2.168 10²³ . This corresponds to option C.

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