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AIIMS2014ChemistrySome Basic Concepts of Chemistry

The number of atoms in 52 ~g of He is

Options

  1. A78.299 10²⁴ atoms
  2. B7.820 10⁻²⁴ atoms
  3. C7.829 10²⁴ atoms
  4. D78.234 10²⁵ atoms

Correct answer

C. 7.829 10²⁴ atoms

Step-by-step solution

Number of atoms = N_A mass At. mass = 6.023 10²³ 52 4 =7.829 10²⁴ atoms

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