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MHT CET202618 April 2026Evening ShiftChemistrySome Basic Concepts of ChemistryActual

Find the number of molecules present in 70 g dinitrogen.

Options

  1. A1.5055 10²⁴
  2. B1.5055 10²³
  3. C3.011 10²⁴
  4. D3.011 10²³

Correct answer

A. 1.5055 10²⁴

Step-by-step solution

Molar mass of dinitrogen ( N₂ ) is 28 g mol ⁻¹ Number of moles of N₂ = 70 28 = 2.5 mol Number of molecules = n N_A Number of molecules = 2.5 6.022 10²³ = 1.5055 10²⁴ Answer: 1.5055 10²⁴

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