One cubic centimeter of 7.15 g/cm³ will contain 9.2 x 10²² Cr atoms.
The density of Cr is 7.15 g/cm³.
It means, one cm³ contains 7.15 grams of Cr.
We know moles are given by,
n = mass/molar mass
n = number of atom/Avogadro number
Molar mass of Cr is 51 g/mol.
So, the number of atoms per cubic centimeter can be found as,
7.15/51 = Number of atom/6.603 x 10²³
Number of atoms = 9.2 x 10²²
So, one cubic centimeter will contain 9.2 x 10²² atoms of Cr.
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