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AnnZ [28]
3 years ago
5

Using the atomic masses and relative abundance of the isotopes of nitrogen given below, determine the average atomic mass of nit

rogen. N-14: 14.003 amu; 99.63% N-15: 15.000 amu; 0.37%
Chemistry
1 answer:
mylen [45]3 years ago
3 0
The formula for average atomic mass is :

mass of isotope A * % of isotope A + mass of isotope B * % of isotope B + ....

Now,
Here,
Average atomic mass of nitrogen = (14.003 * 99.63%) + (15.000 * 0.37%)
                                                 = (14.003 * 0.9963) + ( 15.000 * 0.0037)
                                                 = 13.951 + 0.056
                                                 = 14.007 a.m.u.                                                 
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