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In a fictitious world, element X has only two isotopes: 51x with a mass of 51.0 amu and 54x, with a mass of 54.0 amu.

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In a fictitious world, element X has only two isotopes: 51x with a mass of 51.0 amu and 54x, with a mass of 54.0 amu. The relative abundance of the heavier isotope is 28.73%. The average mass of the atoms of X in a naturally occurring sample of element in this fictitious world is closest to an Select one: a. 53.1 u b. 519 u O. SAU d 51 u

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