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An element has three stable isotopes with masses of 27.977 amu, 28.976 amu, and 29.973 amu. The heavier two isotopes have an abundance 4.68% and 3.09%, respectively. What is the mass of the element? a) 28.085 amu b) 29.251 amu c) 27.684 amu d) 30.107 amu e) 28.991 amu