Problem: Consider the combustion of fuel and the analogous reaction the food undergoes as part of the metabolic processes: fuel/food + O2(g) → CO2(g) + H2O(l) The reverse of this reaction that occurs during photosynthesis is also pretty important: CO2(g) + H2O(l) → fuel/food + O2(g)  Is this reaction endothermic or exothermic? Explain your reasoning. 

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Consider the combustion of fuel and the analogous reaction the food undergoes as part of the metabolic processes:

fuel/food + O2(g) → CO2(g) + H2O(l)

The reverse of this reaction that occurs during photosynthesis is also pretty important:

CO2(g) + H2O(l) → fuel/food + O2(g) 

Is this reaction endothermic or exothermic? Explain your reasoning. 

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