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The standard enthalpy of formation (Delt...

The standard enthalpy of formation `(Delta H^(0))` at 298K for methane, `CH_(4(g))` is 74.8 `kJ mol^(1)`. The additional information required to determine the average energy for C-H bond formation would be

A

The dissociation energy of hydrogen molecule, `H_2`

B

The dissociation energy of `H_2` and enthalpy of sublimation of carbon

C

Latent heat of vaporisation of methane.

D

The first four ionisation energies of carbon and electron gain enthalpy of hydrogen

Text Solution

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The correct Answer is:
B
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Knowledge Check

  • The standard enthalpy of formatin (Delta H ^(0)) at 298 K for methane. CH _(4 (g)) , is 74.8 KJ mol ^(1) The additional information required to determine the average energy for C-H bond formation would be

    A
    The dissociationeneergy of hydrogen molecule, `H_(2)`
    B
    The dissociation energy of hydrogen molecule, `H _(2)`
    C
    Latent heat of vaporisation of methane.
    D
    The first four ionisation energies of carbon and electron gain enthalpy of hydrogen

  • Standard enthapy of vaporisation Delta _(vap) H ^(@) for water at 100^(@) C is 40.55 kJ mol ^(-1). The internal energy of vaporisatio of water at 100^(@)C (in kJ mol ^(-1) )is

    A
    `+37.56`
    B
    `-43.76`
    C
    `+43.76`
    D
    `+40.66`

  • The standard molar engthalpy of vaporisation of benzene Delta_(vap)H^(@) at 353 K is 30.8 kJ mol^(-1) . If the benzene vapours behave as an ideal gas, the change in internal energy of vaporisation of 78 g of benzene at 353 K in kJ mol^(-1) is

    A
    37.87
    B
    27.87
    C
    33.74
    D
    17.87

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