PRETTY PLEASE help me figure out what equation to use to figure this out. PLEASE IM BEGGING!?

Europium crystallizes in a body-centered cubic cell (the Eu atoms occupy only the lattice points). Calculate the mass of the unit cell.








Please help me I am not getting it correct maybe its the formula? Thank you in advance for any help.PRETTY PLEASE help me figure out what equation to use to figure this out. PLEASE IM BEGGING!?
In a body-centered cubic cell, there is 1/8 of an atom at each corner of the cube and one atom in the center. Because there are 8 corners, there is 8 x 1/8 = 1 atom owing to contributions of corner atoms. So each cell has two atoms.





Atomic weight: Eu=152





2atomsEu/1cellEu x 1molEu/6.02x10^23atomsEu x 152gEu/1molEu = 5.05 x 10^-22 g/cell

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