In 2013, the IUPAC recommended that the atomic masses of 12 elements be expressed as an atomic mass interval rather as a single invariant value. (See Section 2-5 and Table 2.2.) For example, the IUPAC recommends that the atomic mass of Cl be given as [35.446, 35.457]. Consequently, the results of calculations involving the atomic mass of chlorine should, in principle, be reported as a range of values. Demonstrate this approach by calculating the range of values possible for the mass percent of silver in an impure sample if all the silver in a 26.39 g sample is converted to 31.56 g of silver chloride.

Table 2.2

Section 2-5

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TABLE 2.2 Conventional Atomic Masses and Atomic Mass Intervals for Selected Elements Atomic Number 1 3 5 6 7 8 12 14 16 17 35 81 Atomic Symbol HEBUNOMESCRE Η Li Mg Si Cl Br TI Atomic Mass, u Conventional 1.008 6.94 10.81 12.011 14.007 15.999 24.305 28.085 32.06 35.45 79.904 204.38 Interval [1.00784, 1.00811] [6.938, 6.997] [10.806, 10.821] [12.0096, 12.0116] [14.00643, 14.00728] [15.99903, 15.9997] [24.304, 24.307] [28.084, 28.086] [32.059, 32.076] [35.446, 35.457] [79.901, 79.907] [204.382,204.385]