On a periodic chart of the elements, molar mass (M), also called atomic weight, is often listed as though it were a dimensionless quantity (Fig. P7–7). In reality, atomic weight is the mass of 1 mol of the element. For example, the atomic weight of nitrogen M_nitrogen = 14.0067. We interpret this as 14.0067 g/mol of elemental nitrogen, or in the English system, 14.0067 lbm/lbmol of elemental nitrogen. What are the primary dimensions of atomic weight?

FIGURE P7–7

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7 8 CN O 12.011 14.0067 15.9994 15 16 Si P S 28.086 30.9738 32.060