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In: Chemistry

​How much energy would be needed to make 10.0 grams of oxygen gas from water?


How much energy would be needed to make 10.0 grams of oxygen gas from water? 

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Expert Solution

Ans : 178.625 kJ   

The reaction is

H2O (l) --------> H2 (g) + 1/2O2 (g) : ΔH =285.8kJ/mol

no of mole of O2 produced = 10 / 32 mol

since ,when 0.5 mole O2 produce from water then 285.8kJ energy was required

so, 10/32 mole O2 produced from water require =285.8/0.5 x10/32 kJ

= 178.625 kJ

queen_honey_blossom answered 2 years ago
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