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To determine the number of O₂ molecules needed to react with 5.51 g of sulfur (S), we first need to know the balanced chemical reaction for the combustion of sulfur, which is:

[ S + O_2 \rightarrow SO_2. ]

From this equation, one mole of sulfur reacts with one mole of oxygen. The molar mass of sulfur is approximately 32.07 g/mol. Therefore, 5.51 g of sulfur is equivalent to about 0.172 moles of S. Consequently, 0.172 moles of O₂ are required, which corresponds to approximately ( 0.172 \times 6.022 \times 10^{23} \approx 1.036 \times 10^{23} ) molecules of O₂.

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