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Question

A hypothetical element, Q, has two stable isotopes, 31Q (isotopic mass = 30.91 amu) and 35Q (isotopic mass = 34.91 amu). If the atomic mass of Q in the periodic table is 33.5 amu, what is the percent abundance of 35Q? Enter your answer in decimal format with three decimal places and no units. (Example answer 27.231)