average atomic mass, Lecture notes of Chemistry

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Nam * Date Period ~-Average-Atomic-Mass lL. ha term “average atomic mass” is a average, and so is calculated differently from a “normal” average. ae iat the average atomic mass of sulfur if 95.00% of all sulfur atoms have a mass of 31.972 amu, 0.76% has a mass of 32.971amu and 4.22% have a mass of 33.967amu. 3. Calculate the average atomic mass of bromine. One isotope of bromine has an atomic mass of 78.92amu and a relative abundance of 50.69%. The other major isotope of bromine has an atomic mass of 80.92amu and a relative abundance of 49.31%. 4. Uranium is used in nuclear reactors and is a rare element on earth. Uranium has three 234 23 common isotopes. If the abundance of ~ U is 0.01%, the abundance of “U is 0.71%, and the abundance of ay is 99.28%, what is the average atomic mass of uranium? ‘ ‘ 35 5. Naturally occurring chlorine that is put in pools is 75.53 percent Cl (mass = 34.969 amu) and 24.47 percent oy (mass = 36.966 amu). Calculate the average atomic mass. Scanned by CamScanner