Percentage frequency of 2, atomic structure (Atom-15) More natural carbon exists to 98.94% from 12C, the remains of which: from 13C (m=13.003355 u). Calculate the expected average carbon mass from these values. What can be deduced from the actual value of 12.0107 (value from PSE))? Calculate the to expected average carbon mass with the the idea, that the masses of m(12C)=12u and m(13C)=13u amount.

  Exercise: Atom-15    

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More natural carbon exists to 98.94% from ¹²C, the remains of which: from ¹³C (m=13.003355 u).

1. Calculate the expected average carbon mass from these values.
2. What can be deduced from the actual value of 12.0107 (value from PSE))?
3. Calculate the to expected average carbon mass with the the idea, that the masses of m(¹²C)=12u and m(¹³C)=13u amount.

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Hinweis: The mass of a C-12 is exactly (definition) 12 u

Solution:

1. 0.9894·12 u + 0.0106·13.003355 u = 12.010635 u
2. The theoretical value ('PSE') is 12.0107 u or 12.0107 g/mol. The small difference lies in rounded frequency values
3. 0.9894·12 u+ 0.0106·13 u = 12.0106 u

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