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Question

How do you calculate the atomic mass of carbon?

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Solution

Atomic mass:

  • The atomic mass of any element actually represents an atomic weight average the sum of the atomic masses of its naturally-occurring isotopes, each multiplied by their respective abundance.
  • Its unit is Unified atomic mass and is denoted as u.

Calculating the atomic mass of Carbon:

  • The atomic number of Carbon is 6.
  • There are two major isotopes of Carbon C-12 and C-13 found in nature, having an abundance 98.89% and 1.10% respectively.
  • To find the average mass of Carbon,

Average mass=(98.89 × 12) +(1.10×13)100 Average mass=1200.3100 Average mass=12.003 u

Therefore, the average atomic mass of Carbon is 12.003 u


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