Home
Class 12
CHEMISTRY
Given that Deltah(f)(H)=218 kJ//mol. Exp...

Given that `Deltah_(f)(H)=218 kJ//mol`. Express the `H-H` bond energy in `K cal//mol`

A

`52.15`

B

`9.11`

C

`104`

D

`52.53`

Text Solution

Verified by Experts

The correct Answer is:
C
Bond energy of hydrogen
`="Enthalpy of formation"xx2`
`=218xx2=436 kJ mol^(-1)`
`=(436)/(4.184)=104.2- cal mol^(-1) [ 1 "calorie"=4.184 "joule" mol^(-1)]`
Promotional Banner

Topper's Solved these Questions

  • CHEMICAL KINETICS

    DINESH PUBLICATION|Exercise Additional Numerical Problems For Practice|16 Videos

  • CHEMISTRY IN EVERY DAY LIFE

    DINESH PUBLICATION|Exercise Unit test-9|50 Videos

Similar Questions

Explore conceptually related problems

Consider the following data : Delta_(f)H^(@)(N_(2)H_(4),l)=50kJ//mol,Delta_(f)H^(@)(NH_(3),g)=-46kJ//mol B.E(N-H)=393" kJ//mol and B.E."(H-H)=436kJ//mol Delta_("vap")H(N_(2)H_(4),l)=18kJ//mol The N-N bond energy in N_(2)H_(4) is :

Bond energies of H-H and Cl-Cl are "430 kJ mol"^(-1) and "242 kJ mol"^(-1) respectively. DeltaH_(f) for HCl is "91 kJ mol"^(-1) . What will be the bond energy of H-Cl ?

The bond enthalpies of H-H and CI-CI are 430 and 242 kJ mol^(-1) , respectively. If DeltaH_(f) (HCI) is -91 kJmol^(-1) the bond enthalpy of HCI would be

Calculate DeltaG_(reaction) ("kJ"//"mol") for the given reaction at 300 K A_(2)(g)+B_(2)(g)hArr2Ab(g) and at particle pressure of 10^(-2) bar and 10^(-4) Given : Delta H_(f)^(@) AB =180 kJ//mol," "DeltaH_(f)^(@) A_(2)=60 kJ//mol Delta H_(f)^(@) B_(2) = 29.5 kJ//mol," "DeltaS_(f)^(@) AB=210 J//K-mol Delta S_(f)^(@) A_(2) = 190 kJ//mol," "DeltaS_(f)^(@) B_(2)=205 J//K-mol Use : 2.303 Rxx300=5750 "J"//"mole"

The H-H bond energy is 430KJ mol^(-1) and Cl-Cl bonds is 240KJ mol^(-1) . DeltaH for HCl is -90KJ . The H-Cl bond energy is about.

DINESH PUBLICATION-CHEMICAL THERMODYNAMICS AND CHEMICAL ENERGETICS -Exercise
  1. Rate of a reaction can be expressed by Arrhenius equation as: k = Ae...

    Text Solution

    |

  2. BaSO(4) is insoluble in water due to its

    Text Solution

    |

  3. Given that Deltah(f)(H)=218 kJ//mol. Express the H-H bond energy in K ...

    Text Solution

    |

  4. Calculate DeltaH^(@) for the reaction Na(2)O(g)+SO(3)(g)toNa(2)SO(4)...

    Text Solution

    |

  5. For the reaction N(2)(g)+3H(2)(g)to2NH(3)(g), which of the following...

    Text Solution

    |

  6. Given that dE=TdS-PdV and H=E+PV, which one of the following relations...

    Text Solution

    |

  7. The activation energies of two reactions are E(1) & E(2) with E(1)gtE(...

    Text Solution

    |

  8. A reaction cannot take place spontaneously at any temperture when

    Text Solution

    |

  9. The heat of atomisation of PH(3)(g) and P(2)H(4)(g) are 954 kJ mol^(-1...

    Text Solution

    |

  10. NH(3)(g)+3Cl(2)toNCl(3)(g)+3HCl(g),DeltaH(1) N(2)(g)+3H(2)(g)to2NH(3...

    Text Solution

    |

  11. If 1 mole of an ideal gas expands isothermally at 37^(@)C from 15 litr...

    Text Solution

    |

  12. The heat liberated when 1.89 g of benzoic acid is burnt in a bomb calo...

    Text Solution

    |

  13. The source of energy in a cellular reaction is

    Text Solution

    |

  14. The work differential, dw, is

    Text Solution

    |

  15. Three moles of an ideal gas expanded spotaneously into vacuum. The wor...

    Text Solution

    |

  16. Which is correct for an endothermic reaction ?

    Text Solution

    |

  17. For an adiabatic process :

    Text Solution

    |

  18. The enthalpy change in the reaction : 2CO+O(2)to2CO(2) is termed a...

    Text Solution

    |

  19. In a reversible isothermal process, the change in internal energy is :

    Text Solution

    |

  20. Based on the following thermochemical equations H(2)O(g)+C(s)rarrCO(...

    Text Solution

    |