Solution:
Step 1: Calculate the molar mass of Pb(C₂H₃O₂)₂.
molar mass = (207.2 g/mol × 1) + (12.01 g/mol × 4) + (1.008 g/mol × 6) + (16.00 g/mol × 4)
molar mass = 325.3 g/mol
Step 2: Calculate the mass percent of O in Pb(C₂H₃O₂)₂.
[tex]\text{mass percent of O} = \frac{\text{16.00 g/mol × 4}}{\text{325.3 g/mol}} × 100[/tex]
[tex]\text{mass percent of O = 19.67\%}[/tex]
Step 3: Calculate the mass of O in Pb(C₂H₃O₂)₂.
[tex]\text{mass of O} = \frac{\text{mass percent of O}}{100} \: × \:\text{mass of Pb(C₂H₃O₂)₂}[/tex]
[tex]\text{mass of O} = \frac{19.67}{100} \: × \:\text{12.66 g}[/tex]
[tex]\boxed{\text{mass of O = 2.490 g}}[/tex]
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