4. Argon has 3 stable isotopes: 36 Ar, 38 Ar, and 40 Ar with natural abundances of 0.3365%, 0.0632%, and 99.6003% respectively. The atomic weights of these 3 isotopes are 35.9675 amu, 37.9627 amu, and 39.9624 amu respectively. Calculate the average atomic weight of Ar.

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