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m : 10 mmol 20 mmol - -
b : 10 mmol 10 mmol 10 mmol 10 mmol
a : - 10 mmol 10 mmol 10 mmol
n PbSO4 = 10 mmol = 0,01 mol
mol = gr/Mr
0,01 = gr/ 303
gr = 3,03 gram
berat endapan 3,03 gram
maaf mungkin tulisannya agak membingungkan karna saya menjawab lewat hp :)