Chlorine exists as two naturally occurring isotopes. Cl-35 occurs 75% of the time and Cl-37 occurs 25% of the time. Which of the

Question

Chlorine exists as two naturally occurring isotopes. Cl-35 occurs 75% of the time and Cl-37 occurs 25% of the time. Which of the following calculations is used to correctly calculate the average atomic mass of chlorine?
(35 amu x 0.75) + (37 amu x 0.25)
(35 amu/2) x (37 amu / 2)
(35 amu +37 amu)/2
(35 amu+75) x (37 amu +25)

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