1.

In which of the following reactions does the heat change represent the heat of formation of water

Answer»

`2H_(2)(g)+O_(2)(g)rarr2H_(2)O(l),DeltaH=-116 kcal`
`H_(2)(g)+(1)/(2)O_(2)(g)rarrH_(2)O(l),DeltaH=-58 kcal`
`H^(+)(aq.)+OH^(-)(aq.)rarr2H_(2)O(l), DeltaH=-13.7 kcal`
`C_(2)H_(2)(g)+2(1)/(2)O_(2)(g)rarr2CO_(2)(g)+H_(2)O(l), DeltaH=-310 kcal`

Solution :HEAT of formation is the formation of one MOLE of the substance from its elements.


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