Question

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Answer 1

Answer: The average atomic mass of nitrogen is 14.0066 amu

Explanation:

Mass of isotope N-14 = 14.00307 amu

% abundance of isotope N-14= 99.64% = $\frac{99.64}{100}$

Mass of isotope N-13 = 15.0001 amu

% abundance of isotope N-13= (0.36)% = $\frac{0.36}{100}$

Formula used for average atomic mass of an element :

$\text{ Average atomic mass of an element}=\sum(\text{atomic mass of an isotopes}\times {{\text { fractional abundance}})$

$A=\sum[(14.00307)\times \frac{99.64}{100})+(15.0001)\times \frac{0.36}{100}]]$

$A=14.0066amu$

Therefore, the average atomic mass of nitrogen is 14.0066 amu