The masses of the naturally occurring mercury isotopes are ¹⁹⁶Hg, 195.9658 u; ¹⁹⁸Hg, 197.9668 u; ¹⁹⁹Hg, 198.9683 u; ²⁰⁰Hg,  199.9683 u; ²⁰¹Hg,  200.9703 u; ²⁰²Hg, 201.9706 u; and ²⁰⁴Hg, 203.9735 u. Use these data, together with data from Figure 2-14, to calculate the weighted-average atomic mass of mercury.

Figure 2-14

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Stream of positive ions Detector 196 198 200 202 204 ||||| | Mass spectrum of mercury vapor Relative number of atoms 25 8 5 T in T O 1 196 197 198 199 200 201 202 203 204 Mass-to-charge ratio