Hydrogen has two naturally occurring isotopes 1h mass, Ask an Expert

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Hydrogen has two naturally occurring isotopes 1H (mass= 100783), and 2H (mass= 2.0140). If the atomic weight of hydrogen is given as 1.0079, which one is the more abundant isotope. I know the answer, thats not what I need. I need an explanation or walk through on how to get the answer

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