Silver has two naturally occurring isotopes: Ag−107 with a mass of 106.905 amu and a natural abundance of 51.84 %, and Ag−109. Use the atomic mass of silver listed in the periodic table to determine the mass of Ag−109.
express answer to 4 sig-figs and use appropriate units
ATomic mass of silver is listed in PT as 107.868
The Attempt at a Solution
x = [107.868 - (106.905 * 0.5184)] / 0.4184
x = 125.4amu
not sure what im doing wrong, thanks for any help