The packing fraction of an irregular unit cell is 0.85. The volume of the unit cell is 7.74 pm3. The atomic radius of an atom in the unit cell is 0.68 pm. How many atoms are in the unit cell? Packing fraction = vol of 1 atom x number of atoms in unit cell Volume of unit cell Volume of atom = (4/3)r3 O 3

1. Large biomolecules can be crystallized into lattices with the same unit cell features as more simple ionic solids. In these cases, a lattice point is occupied by one macromolecule instead of one atom or ion. The crystalline form of a certain protein has density 1.287 g/cm³ and face-centered cubic unit cells with length 12.3 nm. What is the molar mass of the protein?

1. The radius of gold atom is 1.44 Å. What is the length of the unit cell for gold crystals whose atoms are packed according to fcc lattice?

Gold (197.0 g/mol) has cubic crystals whose unit cell has an edge length of 407 pm. The density of the metal is 19.3 g/cm. How many gold atoms are in a unit cell and what type of cubic lattice does gold have 2 atoms, body centered cubic 4 atoms, face centered cubic 1 atom, simple cubic 2 atoms, face centered cubic 4 atoms, body centered cubic

The density of Rh is 12.4 g/mL and the cell volume is 5.50 x 10-23 cm3. Determine the number of atoms in the unit cell. Note: the number of atoms in a unit cell is a whole number.

Fe crystal has a body-centered cubic unit cell. How many atoms of iron are there in the unit cell? 1