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At 25^(@)C, is the standard reaction ent...

At `25^(@)`C, is the standard reaction enthalpy for the reaction `2H(g) +O(g)toH_(2)O(l)` the same as the standard enthalpy of formation of `H_(2)O(l)` ?

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The given reaction does not indicate the formation reaction of `H_(2)O(l)` because the standard states of hydrogen and oxygen at `25^(@)C` are `H_(2)(g)` and `O_(2)(g)`, respectively. Hence, the standard reaction enthalpy of the given reaction is not the same as the standard enthalpy of formation of `H_(2)O(l)`.
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In which of the following reactions At 25^(@)C , does the standard enthalpy change correspond to the standard enthalpy of formation of H_(2)O(l) ? Give reasons. (i) H_(2)(g) +(3)/(2)O_(3)(g) to H_(2)O(l) (ii) H_(2)(g)+(1)/(2)O_(2)(g)toH_(2)O(l) (iii) 2H(g)+O_(2)(g) to H_(2)O(l) .

Calculate the standard enthalpy of reaction at 25^(@)C temperature for the following reaction: C_(6)H_(6)(l)+(15)/(2)O_(2)(g) to 6CO_(2)(g)+3H_(2)O(l) Given:The standard enthalpy of formation of C_(6)H_(6),CO_(2)(g) and H_(2)O(l) are 49.0 kJ *mol^(-1),-393.5kJ*mol^(-1) and -285.8kJ*mol^(-1) respectively.

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