Question

Q.17 Silver has two naturally occuring isotopes, one of mass 107 amu and other of mass 109 amu. Find fraction of abundances for these two isotopes. The atomic mass is 107.8 amu.​

Answer 1

answers

The fractional abundance of Ag-107 is 0.518,

the fractional abundance of Ag-109 is 0.482.

C

Explanation:

Notice that the abundance of Ag-107 (106.91 amu) is assigned “x” and the Ag-109 (108.90 amu) is “1 – x”.

106.91x + 108.90(1 – x) = 107.87

106.91x + 108.90 – 108.90x = 107.87

1.99x = 1.03

x = 0.518

The fractional abundance of second isotope is 1 – 0.518 = 0.482.