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Answer 1

Answer: The average atomic mass of nitrogen is 14.0066 amu

Step-by-step explanation:

Mass of isotope N-14 = 14.00307 amu

% abundance of isotope N-14= 99.64% =
`(99.64)/(100)`

Mass of isotope N-13 = 15.0001 amu

% abundance of isotope N-13= (0.36)% =
`(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}* {{\text { fractional abundance}})`

`A=\sum[(14.00307)* (99.64)/(100))+(15.0001)* (0.36)/(100)]]`

`A=14.0066amu`

Therefore, the average atomic mass of nitrogen is 14.0066 amu