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Chemistry 10 Online
OpenStudy (anonymous):

Silicon has three naturally occurring isotopes. Silicon-28 has a mass of 27.9769. Silicon-29 has a mass of 28.9765 and a relative abundance of 4.68%. Silicon-30 has a mass of 29.9738. If the atomic weight of silicon is 28.085, what are the natural abundance of Silicon-28 and Silicon-30?

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