Livingston Public Schools



Name _____________________________________________________Period ____________Chapter 4: Atomic StructureKeller/RosenzweigAverage Atomic Mass Practice Worksheet1. Two isotopes are known for Element X. 60.0% of all the atoms of element X weight 13.2amu. The other 40.0% of the atoms weigh 14.1amu. Find the average atomic mass of Element X.(13.2amu)(60) + (14.1amu)(40) = 13.56amu1002. Two isotopes are known for Element Y. 35.0% of all the atoms of Element Y have an atomic mass of 29.7 amu. 65.0% of the isotopes have an atomic mass of 32.0amu. Find the average atomic mass of Element Y.(29.7amu)(35) + (32.0amu)(65) = 31.20amu1003. Element Z has three isotopes. The atomic mass and abundance of each is given below. Find the average atomic mass for element Z.Isotope 1112.5Z37.2%Isotope 2116.9Z44.2%Isotope 3114.3Z18.6%(112.5amu)(37.2) + (116.9amu)(44.2) + (114.3amu)(18.6) = 114.78amu1004. Magnesium has 3 isotopes. Find the Average atomic mass for magnesium.Relative abundance23Mg (Mg-23)………..23.0amu0.500 %24Mg (Mg-24)………..24.0amu79.5 %25Mg (Mg-25)………..25.0amu20.0 %(23amu)(0.5) + (24amu)(79.5) + (25amu)(20) = 24.20amu100 ................
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