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Grade: 11
        Assume that each atom in a copper wire contributes one free electron. Estimate the number of free electrons in a copper wire having a mass of 6.4 g (take the atomic weight of copper to be 64 g/mol).
4 years ago

Answers : (1)

Aditi Chauhan
askIITians Faculty
396 Points
							Sol. 64 grams of copper have 1 mole 6.4 grams of copper have 0.1 mole
1 mole = No atoms 0.1 mole = (no × 0.1) atoms
= 6 × 10^23 × 0.1 atoms = 6 × 10^22 atoms
1 atom contributes 1 electron 6 × 10^22 atoms contributes 6 × 10^22 electrons.

						
4 years ago
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