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Bond dissociation enthalpies of H(2)(g) ...

Bond dissociation enthalpies of `H_(2)(g)` and `N_(2)(g)` are `436.0 kJ mol^(-1)` and `941.8 kJ mol^(-1)`, respectively and enthalpy of formation of `NH_(3)(g)` is `-46kJ mol^(-1)`. What is the enthalpy of atomisation of `NH_(3)(g)`?. What is the avergae bond ethalpy of `N-H` bond?

Text Solution

Verified by Experts

`N_(2)(g)+3H_(2)(g)to2NH_(3)(g),DeltaH=-2xx46kJ//mol`
`DeltaH=sum(BE)_(R)-sum(BE)_(P)`
`=(941.8+3xx436)-(6x)=-2xx46` (Here x=BE of N-H bonds)
`x=390kJ" "mol^(-1)`
`NH_(3)toN+3(H)`
Heat of atomization `=3xx390.3=1170.9kJ" "mol^(-1)`.
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Bond dissociation enthalpies of H_(2)(g) and N_(2)(g) are 436.0 kJ mol^(-1) and 941.8 kJ mol^(-1) , respectively, and ethalpy of formation of NH_(3)(g) is -46kJ mol^(-1) . What is the enthalpy fi atomisation of NH_(3)(g) ?. What is the avergae bond ethalpy of N-H bond?

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Knowledge Check

  • Bond dissociation enthalpies of H_(2(g)) and N_(2(g)) are "426.0 kJ mol"^(-1) and "941.8 kJ mol"^(-1) , respectively, and enthalpy of formation of NH_(3(g))" is "-"46 kJ mol"^(-1) . What are the enthalpy of atomisation of NH_(3(g)) and the average bond enthalpy of N-H bond respectively ( in kJ "mol"^(-1) )?

    A
    1170.9, 390.3
    B
    117, 300
    C
    300, 200
    D
    2000, 1975

  • The standard enthalpy of formation of NH_(3) is -46.0kJmol^(-1) . If the enthalpy of formation of H_(2) from its atoms is -436kJmol^(-1) , the average bond enthalpy of N-H bond in NH_(3) is

    A
    `-964kJmol^(-1)`
    B
    `-352kJmol^(-1)`
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    `+1056kJmol^(-1)`
    D
    `-1102kJmol^(-1)`

  • Bond dissociation enthalpy of H_(2), Cl_(2) and HCl are 434, 242 and 431 kJ mol^(-1) respectively. Enthalpy of formation of HCl is

    A
    `- 91 kJ mol^(-1)`
    B
    245 kJ `mol^(-1)`
    C
    93 kJ `mol^(-1)`
    D
    `-245` kJ `mol^(-1)`

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