An element with molar mass 2.7×10-2 kg mol-1 forms a cubic unit cell with edge length 405 pm. If its density is 2.7×103 kg m-3, what is the nature of the cubic unit cell?

question : An element with molar mass 2.7×10^-2 kg mol-1 forms a cubic unit cell with edge length 405 pm. If its density is 2.7×10³ kg m^-3, what is the nature of the cubic unit cell ?

Key points to answer this question :

First of all we need to calculate the number of atoms present in the unit cell (Z) =

Then find the type of the cubic unit cell on the based of number of Z , as follows –

If Z = 1 then This will simple cell (SC)

If Z = 2 then This will Body-centered cubic (BCC)

If Z = 4  then This will be Face-centred Cubic Unit Cell  (FCC)

solution : given data –

Molar mass of the given element , M = 2.7×10^-2 kg mol^-1

Edge length of given cubic unit cell , a = 405 pm