The chemical equation of photosynthesis includes 6O2. What does the small number after the O represent?

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149.3 g of H2O at 95 ◦C is poured over 412 g Fe at 5 ◦C in an insulated vessel. What is the final temperature? The specific heat of H2O is 4.184 J / g· ◦C, the specific heat of Fe is 0.444 J/g · ◦C. Answer in units of ◦C.

The chemical equation of photosynthesis includes 6O2. What does the small number after the O represent?