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Heat of atomisation of NH(3) and N(2)H(4...

Heat of atomisation of `NH_(3)` and `N_(2)H_(4)` are `"x kcal mol"^(-1)` and `"y kcal mol"^(-1)` respectively. Calculate average bond energy of `N-N` bond.

A

`(4y-3x)/(2)" kcal mol"^(-1)`

B

`(2y-3x)/(3)" kcal mol"^(-1)`

C

`(4y-3x)/(4)" kcal mol"^(-1)`

D

`(3y-4x)/(3)" kcal mol"^(-1)`

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The heat of atomisation of PH_(3(g)) is 228kcal mol^(-1) and that of P_(2)H_(2) is 355kcal mol^(-1) . Calculate the average bond energy of P-P bond.

The heat of reaction of N_(2)+3H_(2) to 2NH_(3) is -20 kcal. If the bond energies of H-H and N-H bonds are 104 and 93 kcal/ mole respectively, calculate the bond energy of N-=N bond.

Knowledge Check

  • The heat of atomisation of PH_(3)(g) and P_(2)H_(4)(g) are 954 kJ mol^(-1) and 1485 kJ mol^(-1) respectively. The P-P bond energy in kJ mol^(-1) is

    A
    `213`
    B
    `426`
    C
    `318`
    D
    `1272`

  • The heat of atomisation of PH_(3)(g) and P_(2)H_(4)(g) are 954 kJ "mol"^(-1) and 1485 kJ "mol"^(-1) respectively. The P - P bond energy in kJ "mol"^(-1) is

    A
    213
    B
    426
    C
    318
    D
    1272

  • the heat of atomosaton pf P_(4)H_(4)(g)and PH_(3) (g) are 355 kcal / mol and 228 kcal/ mol respectively . The energy of P----P bond is

    A
    `102 kcal mol ^(-1)`
    B
    `51 kcal mol ^(-1)`
    C
    `26 kcal mol ^(-1)`
    D
    `204 kcal mol ^(-1)`

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