posted by roxanne .
An element has ccp packing with a face-centered cubic unit cell. Its densiry is 2.70E3 kg/m3 and the unit cell volume is 6.64E-29 m3. Calculate the molar mass (g/mol) of the element to 3 significant figures.
Almost like those posted earlier. If you have trouble, post yuor work and tell us in detail what is giving you the trouble.