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#1: Nitrogen (N) is made up of 99.632% 14N and 0.368% 15N. The atomic mass of 14N is 14.003 amu. The atomic mass of 15N is 15.000 amu. What is the average atomic mass of nitrogen?

A. 14.0 amu

B. 14.006 amu

C. 15.00 amu

D. 15.50 amu
**my answer: B.
but idk 100% :/,

Respuesta :

W0lf93
The answer B is indeed correct. In order to calculate the average atomic mass of nitrogen we have to change the percentages to mole fractions. The total is : (14.003 amu * 0.99632)+(15.000 amu * 0.00368) = 14.0067 amu which is the answer B.

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