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Aluminum has a density of 2.70 x 10³ kg/m³ at a temperature of 293 K, and its molar mass is 26.98 g. (a) Compute the number of aluminum atoms per unit volume at that temperature. (b) Use the fact that E_F 11.63 eV for aluminum at 293 K to fi nd the number density of free electrons. (c) Combine your results from (a) and (b) to estimate the number of conduction electrons per atom—the valence number for aluminum

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