Home
Class 12
CHEMISTRY
Energy required to dissociate 4g of gase...

Energy required to dissociate `4g` of gaseous hydrogen into free gaseous atoms is `208Kcal` at `25^(@)C`
The bond energy of `H-H` bond will be

A

104 kcal

B

52kcal

C

10.4kcal

D

1040 kcal

Text Solution

Verified by Experts

The correct Answer is:
A
No of moles of hydrogen
`=("Mass")/("Molecular mass")=4/2=2`moles
Given `underset(4g)(2H_(2)(g))to4H(g), DeltaH=208` kcal
`:.H_(2)(g)to2H(g)DeltaH=104` kcal
`:.underset("1mol")(H_(2)(g))to2H(g)DeltaH=104` kcal
`:.` Bond energy of H-H bonds is 104 kcal
Promotional Banner

Topper's Solved these Questions

  • THE SOLID STATE

    DISHA PUBLICATION|Exercise EXERCISE -2 : CONCEPT APPLICATOR|30 Videos

Similar Questions

Explore conceptually related problems

Energy required to dissociate 4 g of gaseous H_(2) into free gaseous atoms is 872 kJ at 25^(@)C . The bond energy of H-H bond will be

Energy required to dissociate 4 gms of H_(2)(g) into free atoms is 208 K.cals at 25^(@)C . The H-H bond energy will be

The energy required to break 76 gm gaseous fluorine into free gaseous atom is 180 kcal at 25^(@) C. The bond energy of F - F bond will be

Calculate the bond energy of C-H Bond in methane.

The average energy required to break a P-P bond in P_(4)(s) into gaseous atoms is 53.2 kcal mol^(-1) . The bond dissociation energy of H_(2)(g) is 104.2kcal mol^(-1) , Delta H_(f)^(0) of PH_(3)(g) from P_(4)(s) is 5.5 kcal mol^(-1) . The P-H bond energy in kcal mol^(-1) is [ Neglect presence of Van der Waals force in P_(4)(s) ]

Total energy required to break all the bonds in the gaseous state molecule of AB_(2) is xkJmol^(-1) . Then the bond energy of the bond A-B in the molecule will be ________.

DISHA PUBLICATION-THERMODYNAMICS-Exercise
  1. Equal volumes of molar hydrochloric acid and sulphuric acid are neutra...

    Text Solution

    |

  2. The reaction A to B , DeltaH=+24 kJ//"mole". For the reaction B to C, ...

    Text Solution

    |

  3. Energy required to dissociate 4g of gaseous hydrogen into free gaseous...

    Text Solution

    |

  4. Calculate enthalpy change for the change 8S(g)toS(8)(g), given that ...

    Text Solution

    |

  5. An ideal gas is allowed to expand both reversibly and irreversibly in ...

    Text Solution

    |

  6. On the basic of thermochemical equations (I),(II)and (III), Find out w...

    Text Solution

    |

  7. Following reaction occurring in an automobile 2C(8)H(18)(g)+25O(2)(g) ...

    Text Solution

    |

  8. Enthalpy of CH(4)+(1)/(2)O(2)rarrCH(3)OH is negative. If enthalpy of...

    Text Solution

    |

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

    Text Solution

    |

  10. Calculate the standard enthalpy change (in kJ "mol"^(-1)) for the reac...

    Text Solution

    |

  11. Four grams of graphite is burnt in a bomb calorimeter of heat capacity...

    Text Solution

    |

  12. The standard enthalpy of formation (Delta(f)H^(@)) at 298K for methan...

    Text Solution

    |

  13. At 25^(@)C and 1 bar which one of the following has a non zero DeltaH(...

    Text Solution

    |

  14. The enthalpy of neutralization of NH(4)OH and CH(3)COOH is – 10.5 kcal...

    Text Solution

    |

  15. 250 mLof 0.1 M HCL and 250 mL of 0.1 M KOH, both being at the same tem...

    Text Solution

    |

  16. When 0.2 mole of anhydrous CuSO(4) is dissolved in water, the heat ev...

    Text Solution

    |

  17. The standard heat of formation values of SF(6)(g), S(g), and F(g) are ...

    Text Solution

    |

  18. Calculate the standard enegry change for the reaction: OF(2)(g) +H(2...

    Text Solution

    |

  19. The fat C(57)H(104)O(6)(s), is metabolised via the following reaction ...

    Text Solution

    |

  20. Stearic acid [CH(3)(CH(2))(16)CO(2)H] is a fatty acid the part of fat ...

    Text Solution

    |