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Question

Consider the following reactions :

I) H+(aq)+OH(aq)=H2O(l);ΔH=X1 kJ.mol1
II) H2(g)+12O2(g)=H2O(l);ΔH=X2 kJ.mol1
III) CO2(g)+H2(g)=CO(g)+H2O(l);ΔH=+X3 kJ.mol1
IV) C2H2(g)+52O2(g)=2CO(g)+H2O(l);ΔH=+X4 kJ.mol1
Enthalpy of formation of H2O(l) is:

A
+X1 kJ.mol1
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B
X2 kJ.mol1
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C
+X3 kJ.mol1
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D
+X4 kJ.mol1
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Solution

The correct option is A X2 kJ.mol1
The standard enthalpy change of formation of a compound is the enthalpy change which occurs when one mole of the compound is formed from its elements under standard conditions. The equation showing the standard enthalpy change of formation of water is
H2(g)+12O2(g)H2O(l)

1 mole of water formed.
Enthalpy of formation is X2kJ/mol.

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