A protein forms crystals of the orthorhombic type with unit-cell dimensions of 13.0 × 7.48 × 3.09 nm. If the density of the crystal is 1.315 g cm-3 and there are six protein molecules per unit cell, what is the molar mass of the protein?

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Crystal Lattices and Unit Cell

Consider a crystal. The regular and repeating pattern of constituent particles is the most distinguishing feature of crystalline solids. A crystal lattice is formed when these particles are replaced with representative points. The three-dimensional arrangement of constituent particles is known as a crystal lattice. Unit cell is that the smallest portion of a space lattice which when repeated in several directions, generate the whole lattice. Unit cell is a building block of a lattice. It is the smallest unit of cell.