Question

Question

Answer 1

The mass of a copper atom is 1.06 ✕ 10−25 kg, and the density of copper is 8920 kg/m3.
(a) Determine the number of atoms in 1 cm3 of copper.

Answer 2

Convert your density to kg/cm^3 then divide my the mass of an atom.

Answer 3

here is my reasoning:
we have 8.93 grams of copper in 1 cm3, now the atomic mass of copper is 63.5, so, we have:
\[\frac{{8.93}}{{63.5}} = ...?\]
moles of copper in 1 \(cm^3\), therefore, we have:
\[\frac{{8.93}}{{63.5}} \cdot 6.023 \cdot {10^{23}} = ...?\]
atoms of copper in 1 \(cm^3\), being:
\[{N_A} = 6.023 \cdot {10^{23}}\]
the number of Avogadro