The element weirdium (We), found only on the planet Crosbia has only two isotopes; We-60 (60.00 amu) and We-90 (90.00 amu)! The average atomic mass of a naturally occurring sample
of weirdium is 70.00 amu. Calculate the percent abundance of We-60.

the answer is 303.15 or 303

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it was spontaneous.

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