Unit cell) calculate atomic radius in picometers; not sure how to get volume or side length if I even need them

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A: Given, The amount of 0.38 M solution can be made from a296mL 4.65 M solution is:   

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A:                              

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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.