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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