Answered Essay: Calculate the atomic mass of nitrogen. One isotope of nitrogen has an atomic mass of 14.003

Calculate the atomic mass of nitrogen. One isotope of nitrogen has an atomic mass of 14.003 amu and the other isotope has an atomic mass of 15.000 amu. The lighter isotope has a relative abundance of 98.89%.

Expert Answer

The overall definition of average molar weight of a species:

MW of N2 = x1*MW1 + x2*MW2

where x1,x2 is the abundance in fracitonal value and MW are the molar weghts of each spcies

x1 = 98.89/100 = 0.9889


x1+x2 = 1 always

x2 = 1-x1 = 1-0.9889 = 0.0111



MW average = (0.9889)(14.003) + 0.0111*15.000

MW average = 14.0140667 amu; which is the atomic mass of nitrogen

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