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Concepts Of Physics MCQ Edition [Volume 2]PhysicsElectric Field and Potential

Estimate the number of free electrons in a copper wire possessing a mass of 64 g , assuming that each atom contributes one free electron (take the atomic weight of copper as 64 g mol ⁻¹ ).

Options

  1. A6.02 10²²
  2. B6.02 10²³
  3. C3.01 10²³
  4. D1.20 10²⁴

Correct answer

B. 6.02 10²³

Step-by-step solution

Number of moles of copper is given by n = Mass Atomic weight = 64 64 = 1 mol Number of copper atoms in 1 mol is equal to Avogadro's number, N_A = 6.02 10²³ Since each copper atom contributes one free electron, the total number of free electrons is equal to the number of copper atoms. Number of free electrons = 6.02 10²³

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