Question

An electrically neutral coin of mass is 3.0g contains equal amount of positive and negative charge. Assuming the coin is made up of pure copper what's the magnitude of the total positive or negative charge on the coin?molar mass of copper =63.5g mole^-1

Answer 1

Explanation:

Since, we know one atom of copper contains =29 electrons or protons. So, 0.295×1023 atoms contain =29×0.295×1023 electrons or protons. So, the total positive or negative charge on a 3.11g copper penny is 1.37×105C approx. Therefore, the correct option is (C).

Answer 2

Answer:

63.5 g of Cu = 1 mole

3 g of Cu = 3/63.5 moles

No of atoms of Cu in 3 g = (3/63.5) × 6.023 × 10²³

An atom of copper contains 29 electrons and 29 protons

Therefore the charge on 1 atom of Cu = +29e where e = 1.6 × 10⁻¹⁹

Since it is an electrically neutral coin:

Total positive charge = Total negative charge = (3/63.5) × 6.023 × 10²³ × 29 × 1.6 × 10⁻¹⁹

= 1.36 x 10⁵ C

Therefore the magnitude of charge on the coin is 1.36 x 10⁵ C

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