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8 November, 11:56

The atomic mass of 12C is 12.000000. Multiply the atomic mass of 12C by its abundance. Report the number to 5 significant digits.

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Answers (2)
  1. 8 November, 11:59
    0
    Answer : The average mass of carbon is, 11.872 amu

    Explanation : Given,

    Atomic mass of C-12 = 12.000000 amu

    Natural abundance of C-12 = 98.93 % = 0.9893

    Average atomic mass of an element is defined as the sum of masses of each isotope each multiplied by their natural fractional abundance.

    Average mass of carbon = Atomic mass of C-12 * Natural abundance of C-12

    Average mass of carbon = 12.000000 * 0.9893

    Average mass of carbon = 11.872 amu

    Thus, the average mass of carbon is, 11.872 amu
  2. 8 November, 12:03
    0
    1187.2

    Explanation:

    Given dа ta:

    Atomic mass of C₁₂ = 12.000000.

    Multiplication of its abundance and mass = ?

    Solution:

    The natural abundance of carbon-12 is 98.93%.

    98.93 * 12. 000000 = 1187.16

    Answer in five significant figures:

    1187.2
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