question_answer

Mean mass of an element is 39.1 amu, The masses of its isotopes are 39, 40, 41 amu. If the abundance isotope of 40 amu is 0.012%, then relative abundance of other two is:

A)  93.7, 6.233         

B)         90.237, 8.751    

C)                         93.073, 6.915    

D)         91.387, 8.603