Copper is a very important metal used for water pipes, electrical wiring, roof coverings, and other materials. When a sample of natural copper is vaporized and injected into a mass spectrometer, the results shown in Fig. 3.3 are obtained. Use these data to compute the average mass of natural copper. (The mass values for ⁶³Cu and ⁶⁵Cu are 62.93 amu and 64.93 amu, respectively.)

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Relative number of atoms 100 80 60 40 20 0 69.09 30.91 63 65 Mass number FIGURE 3.3 Mass spectrum of natural copper.