Isotope: 35 AMU: 34.968852 % Abundance: 75.77; Isotope: 37 AMU: 36.965903 % Abundance: 24.23 The two isotopes for Cl are chlorine-35 and chlorine-37. What is the average mass for Cl up to 4 decimal places?

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Answer 1 · 2016-10-23T19:57:31

#"Average mass"# #=# #"35.45 amu"#

The average mass is simply the weighted average:

#(34.968852xx75.77%+36.965903xx24.23%)*"amu"#

#=# #35.4527*"amu"#