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svlad2 [7]
3 years ago
15

as a solid, Cr adopts a body-centered cubic unit cell. How many unit cells are present per cubic centimeter of Cr?

Chemistry
1 answer:
Rufina [12.5K]3 years ago
8 0
D(Cr) = 8,96 g/cm3 

<span>M(Cr) = 63,546 g/mol </span>

 

<span>In a cell face centred cubic, there are 4 atoms of Cur . . . ! </span>

<span>n(Cr in 1 cm3) = m(Cu) / M(Cr) </span>
<span>n(Cr in 1 cm3) = 8,96 / 63,546 </span>
<span>n(Cr in 1 cm3) = 0,141 mol of Cr </span>


<span>Avogadro's number is : NA = 6,02•10^23 mol^-1 </span>


<span>N(Cr) = n(Cu) x NA </span>
<span>N(Cr) = 0,141 x 6,02•10^23 </span>
<span>N(Cr) = 8,488•10^22 atoms of Cr </span>

<span>N(cell) = N(Cu) / 4 </span>
<span>N(cell) = 8,488•10^22 / 4 </span>
<span>N(cell) = 2,122•10^22 cells in 1 cm3</span>
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