1. A hypothetical element consists of two isotopes of masses 79.95 amu and 81.95 amu with abundances of 31.3% and 68.7%, respectively. What is the average atomic mass of this element?
(A) 80.95 amu
(B) 79.95 amu
(C) 80.6 amu
(D) 81.3 amu
(E) 81.95 amu

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