Home
Class 11
CHEMISTRY
If the end energies of H-H, Br-Br and H-...

If the end energies of H-H, Br-Br and H-Br are 433, 192 and 364 kJ `mol^(-1)` respectively, then `DeltaH^(@)` for the reaction, `H_(2)(g)+Br_(2)(g)to2HB r(g)` is

A

`+261kJ`

B

`-103kJ`

C

`-261kJ`

D

`+103 kJ`

Text Solution

Verified by Experts

The correct Answer is:
B
`H- H+ Br- Br rarr 2H- Br`
`433+192 " " 2 xx 364`
`625 " " 728`
Energy absorbed= Energy released
Net energy released = 728-625= 103kJ
i.e, `Delta H= -103kJ`
Promotional Banner

Topper's Solved these Questions

  • THERMODYNAMICS AND THERMOCHEMISTRY

    ERRORLESS|Exercise (Assertion & Reason)|18 Videos

  • THERMODYNAMICS AND THERMOCHEMISTRY

    ERRORLESS|Exercise NCERT Based Questions (Free Energy and Work Function) |37 Videos

  • THE S-BLOCK ELEMENTS

    ERRORLESS|Exercise Assertion & Reason|10 Videos

Similar Questions

Explore conceptually related problems

If the end energies of H-H, Br-Br and H-Br are 433, 1992 and 364 kJ mol^(-1) respectively, then DeltaH^(@) for the reaction, H_(2)(g)+Br_(2)(g)to2HB r(g) is

The bond energies of H--H , Br--Br and H--Br are 433,, 192 and 364KJmol^(-1) respectively. The DeltaH^(@) for the reaction H_(2)(g)+Br_(2)(g)rarr2HBr(g) is

DeltaH_(t)^(@) for CO_(2)(g) and H_(2)O(g) are -393.5, -110.5 and -241.8 kJ"mol"^(-1) respectively. The standard enthalpy change (in kJ) for the reaction. CO_(2)(g) + H_(2)(g) to CO(g) + H_(2)O(g) is:

The DeltaH_(f)^(@) for CO_(2)(g) , CO(g) and H_(2)O(g) are -395.5,-110.5 and -241.8" kJ" mol^(-1) respectively. The standard enthalpy change in (in kJ) for the reaction CO_(2)(g)+H_(2)(g)toCO(g)+H_(2)O(g) is

ERRORLESS-THERMODYNAMICS AND THERMOCHEMISTRY-PAST Years Questions
  1. How much energy is released when 6 mole of octane is burnt in air ? Gi...

    Text Solution

    |

  2. The following two reactions are known: Fe(2)O(3)(s)+3CO(g)to 2Fe(s)+...

    Text Solution

    |

  3. If the end energies of H-H, Br-Br and H-Br are 433, 192 and 364 kJ mol...

    Text Solution

    |

  4. Enthalpy change for the reaction, 4H((g))rarr 2H(2(g)) is -869.6 kJ ...

    Text Solution

    |

  5. The enthalpy of hydrogenation of cyclohexene is -119.5kJ mol^(-1). If ...

    Text Solution

    |

  6. The values of DeltaH and DeltaS for the reaction, C("graphite")+CO(2...

    Text Solution

    |

  7. Which of the following pairs of a chemical reaction is certaion to res...

    Text Solution

    |

  8. The enthalpy and entropy change for the reaction Br(2)(l) + Cl(2)(g)...

    Text Solution

    |

  9. The standard enthalpy or the decomposition of N2 O5 to NO2 is 58.04 kJ...

    Text Solution

    |

  10. Standard enthalpy and standard entropy changes for the oxidation of am...

    Text Solution

    |

  11. For vaporization of water at 1 atmospheric pressure, the values of Del...

    Text Solution

    |

  12. Using the Gibbs energy change, Delta G^(@)=+ 63.3 kJ, for the followin...

    Text Solution

    |

  13. Which of the following statements is correct for a reversible process ...

    Text Solution

    |

  14. The correct thermodynamic conditions for the spontaneous reaction at a...

    Text Solution

    |

  15. Which of the following is true fo the reacion H(2)O(l)hArr H(2)O(g) at...

    Text Solution

    |

  16. For a spontaneous process the correct statement is -

    Text Solution

    |

  17. For the equilibrium H(2)O(l) iff H(2)O(g) at 1 atm and 298 K

    Text Solution

    |

  18. Match List I ( Equations) with List II (Type of processes) and select...

    Text Solution

    |

  19. For a given reaction, Delta H = 35.5 kJ mol^(-1) and Delta S = 83.6 JK...

    Text Solution

    |

  20. Which of the following is correct option for the free expansion of an ...

    Text Solution

    |