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A sample containing 12C, 16O, and an unknown isotope is analyzed in a mass spectrometer. As...

A sample containing 12C, 16O, and an unknown isotope is analyzed in a mass spectrometer. As in the figure, the ions move around a semicircle before striking a photographic plate. The 12C+ and 16O+ ions are separated by 3.850 cm on the plate, and the unknown isotope strikes the plate 1.130 cm from the 12C+ ions. What is the mass of the unknown element?

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