
Tej K. answered 10/21/19
Tutor
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3rd Year Medical Student, Math/Science/ACT(35)/SAT(2370) Expert
Moles=G/Molar Mass
The molar mass of cesium is 132.9.
Grams that are given is 64.51.
So Moles = 64.51/132.9=.485 mols of Cesium
Hope that helped!