What is the Mass Ratio Between 12C and 13C Atoms?

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The discussion focuses on calculating the mass ratio between carbon-12 (12C) and carbon-13 (13C) atoms. The user attempted to find the ratio by dividing the atomic weight of carbon (12.011) by that of carbon-13 (13), resulting in approximately 0.9239. However, the book provides a slightly different answer of 0.92286, prompting questions about the use of atomic weights. The user acknowledges that atomic weights are weighted averages and expresses confusion about how to properly set up the calculation. Clarification is needed on the distinction between atomic weights and the actual masses of the isotopes for accurate ratio determination.
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Homework Statement



What is the ratio of mass of a 12C atom to a 13C atom

The Attempt at a Solution



12.011/13 = .9239230769

Solution given at back of book = .92286
 
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Why 12.011? Why 13?
 
The atomic weight of C-12 is 12.011, the atomic weight of C-13 is 13. I divided the weight of C-12 by the weight of the C-13 to get a ratio.
 
12.011 is not an atomic weight of C-12, just like 35.45 is not a mass of Cl atom.
 
Ok, I understand that the atomic weight's are weighted averages. I just used the atomic weight because it asks for a ratio between two atoms. As for how to set it up I don't have the slightest idea how to set it up, no example problems to model form, nor solution steps.
 

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