Iron (Fe) undergoes an allotropic transformation at 912oC: upon heating from a BCC ( phase) to an

Question:

Iron (Fe) undergoes an allotropic transformation at 912oC: upon heating from a BCC (α phase) to an FCC (( phase). Accompanying this transformation is a change in the atomic radius of Fe-from RBCC = 0.12584 nm to R= = 0.12894 nm-and, in addition a change in density (and volume). Compute the percent volume change associated with this reaction. Does the volume increase or decrease?