Chemistry
Jessi809
16

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

+1
(1) Answers
longhornlova12

d(Cr) = 8,96 g/cm3  M(Cr) = 63,546 g/mol    In a cell face centred cubic, there are 4 atoms of Cur . . . !  n(Cr in 1 cm3) = m(Cu) / M(Cr)  n(Cr in 1 cm3) = 8,96 / 63,546  n(Cr in 1 cm3) = 0,141 mol of Cr  Avogadro's number is : NA = 6,02•10^23 mol^-1  N(Cr) = n(Cu) x NA  N(Cr) = 0,141 x 6,02•10^23  N(Cr) = 8,488•10^22 atoms of Cr  N(cell) = N(Cu) / 4  N(cell) = 8,488•10^22 / 4  N(cell) = 2,122•10^22 cells in 1 cm3

Add answer