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Please find below the solution to the asked query
 
The light dependent splitting of water is called photolysis. 
2H₂O $\Rightarrow$4H⁺ + O₂ +  4e^_

2 molecules of water on photolysis produce 4H^{+ ,} 1O₂ and 4e^_​​
Hence 8H₂O molecules will produce: 
8H₂O $\Rightarrow$16H⁺ + 4O₂ +  16e^_  
Hope this information will clear your doubts about the topic.
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