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The atmosphere of the planet Argos contains the following atom percentages of the isotopes of argon: 36Ar(atomic mass 35.968 amu), 70.0%, 38Ar (atomic mass 37.963 amu), 20.0% and 40Ar (atomic mass 39.962 amu), 10.0%. The average atomic mass of argon(the atomic mass on the periodic table on Argos) on planet Argos will then be...