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12 June, 02:17

C-12 and c-13 are naturally occurring isotopes of the element carbon. c-12 occurs 98.89% of the time and c-13 occurs 1.108% of the time. what calculation should be used to determine the atomic mass of this element?

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  1. 12 June, 03:18
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    W₁ (¹²C) = 0.9889 (98.89%)

    w₂ (¹³C) = 0.01108 (1.108%)

    A (¹²C) = 12

    A (¹³C) = 13

    A (C) = w₁A (¹²C) + w₂A (¹³C)

    A (C) = 0.9889*12+0.01108*13=12.01084 a. m. u.
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