How many electrons are in a cubic inch of copper?

Answer 1

Given:

1 cubic inch = 16.387064 cubic centimeters.

Density of copper at STP = 8.94 g/cm^3.

Copper has 29 electrons per atom.

GMW Cu: 63.546 g/mol

NA: 6.02 x 10^23

Calculate:

One cubic inch of copper converted to cubic centimeters: 16.387064 cm^3

16.387064 cm^3 * 8.94 grams/cm^3 = 146.50035216 grams

Moles of copper in 146.50035216 grams: 2.30542 mol

Atoms in 2.30542 moles: 1.38786284 x 10^24

Electrons in 1.38786284 x 10^24 moles: 4.024802236 x 10^25

Note: The precision of the answer is driven by the three significant digits in the density value and the approximation of Avogadro's number.

Round to 3 significant digits: 4.02 x10^25 electrons is your final answer.