Answer:
7.15g/cm³
Explanation:
To solve this question we must know that a body-centered cubic unit cell contains 2 atoms.
The volume of the unit cell is:
289pm = (289x10⁻¹²m)³ =
2.414x10⁻²⁹m³ * (1cm³ / 1x10⁻⁶m³) = <em>2.414x10⁻²³cm³</em>
<em />
And the mass is -Molar mass Chromium = 51.9961g/mol:
2atoms * (1mol / 6.022x10²³atoms) * (51.9961g / mol) =
<em>1.727x10⁻²²g</em>
<em />
The density is:
1.727x10⁻²²g / 2.414x10⁻²³cm³ =
<h3>7.15g/cm³</h3>