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The bond enthalpies of D-D and 0-0 and D...

The bond enthalpies of D-D and 0-0 and D - ( are respectively, + 440, + 498 and `+ 491.5 kJ mol^(-1).` Calculate `DeltaH` for the reaction `D _(2 (g)) + (1)/(2) O _(2(g)) to D _(2) O _((l))`

Text Solution

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Heat of reaction, `DeltaH = `(Enthalpy of bonds dissociated) - (Enthalpy of bonds formed)
`Delta H = (440 + (498)/(2)) - (2 xx 491 .5)`
`=689-983 =-294 kJ`
Enthalpy of the given reaction is `- 294 kJ .`
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