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13 April, 13:45

Nitrogen has two isotopes. One has an atomic mass of 14.003

amu and a relative abundance of 99.63% while the other

isotope has an atomic mass of 15.000 amu and a relative

abundance of 0.37%. What is the average atomic mass for

nitrogen?

a

14.456 amu

b

14.778 amu

C 14.993 amu

d 14.007 amu

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Answers (1)
  1. 13 April, 14:00
    0
    d = 14.007 amu

    Explanation:

    Abundance of N¹⁴ = 99.63%

    Abundance of N¹⁵ = 0.37%

    Atomic mass of N¹⁴ = 14.003 amu

    Atomic mass of N¹⁵ = 15.000 amu

    Average atomic mass = ?

    Solution:

    Average atomic mass = (abundance of 1st isotope * its atomic mass) + (abundance of 2nd isotope * its atomic mass) / 100

    Average atomic mass = (14.003 * 99.63) + (15.000 * 0.37) / 100

    Average atomic mass = 1395.12 + 5.55 / 100

    Average atomic mass = 1400.67 / 100

    Average atomic mass = 14.007 amu.
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