$\overline{){\mathbf{Atomic}}{\mathbf{}}{\mathbf{Mass}}{\mathbf{=}}{\mathbf{(}\mathbf{mass}\mathbf{\times}\mathbf{f}\mathbf{.}\mathbf{a}\mathbf{.}\mathbf{)}}_{\mathbf{isotope}\mathbf{}\mathbf{1}}{\mathbf{}}{\mathbf{+}}{\mathbf{(}\mathbf{mass}\mathbf{\times}\mathbf{f}\mathbf{.}\mathbf{a}\mathbf{.}\mathbf{)}}_{\mathbf{isotope}\mathbf{}\mathbf{2}}}$

Use the mass spectrum of rubidium to determine the atomic mass of rubidium.

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