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Need help on this question! A reagent occasionally used in chemical synthesis is sodium–potassium alloy. (Alloys are mixtures of metals, and - has the interesting property that it is a liquid.) One formulation of the alloy contains 65 atom percent ; that is, out of every 100 atoms, 65 are and 35 are . What is the mass percent of potassium in sodium–potassium alloy?