There is 0.078 grams of copper in a penny.
d = 7.20 g/cm³; density of a penny
diameter of a penny = 19.05 mm
thickness of a penny = 1.52 mm
area of a penny = π/ × (d/2)²
area of a penny = 3.14 × (19.05 mm/2)²
area of a penny = 285 mm²
Volume of a penny is the measure of the amount of space occupied by a penny.
volume of a penny = 285 mm² × 1.52 mm
volume of a penny = 433.2 mm³ = 0.4332 cm³
mass of a penny = 0.4331 cm³ × 7.20 g/cm³
mass of a penny = 3.12 g
mass of a copper = 2.50 % × 3.12 g ÷ 100%
mass of a copper = 0.078 g
number of a copper atoms = 0.078 g ÷ 63.54 g/mol × 6.022×10²³
number of a copper atoms = 7.39×10²⁰
More about volume: brainly.com/question/4936894
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