3) What is the mass % of oxygen in lead (II) nitrate (Pb(NO3)2) rounded to three significant figures? A) 29.0 B) 14.5 C) 4.83 D) 19.3 4) How many grams of phenol (C6H5OH) are contained in 5.50 mol of phenol? A) 9.14 _10-24 B) 3.31 _1024 C) 94.1 D) 518
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