A solution with a mass of 1.263g contain...

A solution with a mass of 1.263g containing an unkown amount of potassium ions was treated with excess sodium tetraphenylborate to precipitate 1.003g of KB `(C_(6)H_(5))_(4)` (M = 358.33). What is the mass percentage of potassium in the original solution?

0.0864

0.0916

0.109

0.138

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