The atomic masses of  (75.78 percent) and  (24.22 percent) are 34.969 and 36.966 amu, resp...

The atomic masses of  (75.78 percent) and  (24.22 percent) are 34.969 and 36.966 amu, respectively. Calculate the average atomic mass of chlorine. The percentages in parentheses denote the relative abundances.