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A sample containing oxygen, carbon and an unknown element is located in a mass spectrometer. The ions all have the same charge and are accelerated through the same potential difference before entering the magnetic field. The carbon and oxygen lines are separated by 2.250 centimeter on the photographic plate, and the unknown element makes a line between them that is 1.160 centimeter from the carbon line.

a) Compute the mass of the unknown element?

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