We know that : `:("Formula mass",=,"Mass of",+,"Mass of",+,"Mass of"),("of" K_(2)CO_(3),,2"K atoms",,"one C atom",,3 'O' "atom"):` `= 2 xx 39 + 12 + 3 xx 16` `= 78 + 12 + 48` `= 138 u` Thus, the formula mass of potassium lead carbonate is `138 u`.

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