Question

A sample of chlorine has two naturally occurring isotopes. The isotope Cl-35 (mass 35.0 amu) makes up 75.8% of the sample, and the isotope Cl-37 (mass = 37.0 amu) makes up 24.3% of the sample. What is the average atomic mass for chlorine?
A) 36.0 amu
B) 35 amu
C) 36.6 amu
D) 35.5 amu
E) 35.521 amu

Answer

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