Home
Class 12
CHEMISTRY
The bond dissociation energy of C-H in C...

The bond dissociation energy of C-H in `CH_4` from the equation
`C(g) + 4H(g) to CH_4(g), DeltaH = -397.8` kcal is :

A

`+ 99.45 kcal`

B

`-99.45 kcal`

C

`+397 .8 kcal`

D

`+ 198.9 kcal`

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

  • ISOMERISM IN ORGANIC COMPOUNDS

    MODERN PUBLICATION|Exercise RECENT EXAMINATION QUESTIONS|1 Videos

  • MOCK TEST PAPER - 3

    MODERN PUBLICATION|Exercise MCQs|60 Videos

Similar Questions

Explore conceptually related problems

For the reaction : CO(g)+2H_(2)(g)hArr CH_(3)OH(g)

The heat of combustion of C_(2)H_(6) is -368.4 kcal . Calculate the heat of combustion of C_(2)H_(2) , when the heat of combustion of H_(2) is 68.32 kcal mol^(-1) . C_(2)H_(4)(g) + H_(2)(g) rarr C_(2)H_(6)(g) , Delta H = 37.1 kcal .

The enthalpy changes at 25^(@)C in successive breaking of O - H bonds of water are : H_(2)O(g) rarr H(g) + OH(g) Delta H = 498 kJ mol^(-1) OH(g) rarr H(g) + O(g) Delta H = 428 kJ mol^(-1) The bond enthalpy of the O-H bond is :

The dissociation energy of CH_(4) and C_(2)H_(6) are respectively 1508 and 2594 kJ mol^(-1) respectively. The bond energy of C-C bond is

Calculate the enthalpy of formation of methane from the following data. C_((s))+O_(2_((g)))toCO_(2)(g)DeltaH^(@)=-393.5kJ …………..1 H_(2_((g)))+1/2O_(2(g))toH_(2)O_((l))DeltaH^(@)=-285.8kJ …………2 CH_(4_((g)))+2O_(2_((g))) rarr CO_(2)(g)+2H_(2)O_((l))DeltaH^(@)=-890kJ ......................3

The standard entropy change Delta S_r^@ for CH_(4(g)) + 2O_(2(g)) to CO_(2(g)) + 2H_2O_((l)) is -242.98 JK^(-1) at 25^@C . Calculate the standard reaction enthalpy for the above reaction if standard Gibbs energy of formation of CH_(4(g)), CO_(2(g)) and H_2O_((l)) are -50.72, -394.36 and - 237.13 kJ mol^(-1) respectively.

With the help of a thermochemical equation, calculate Delta_(f)H^(@) at 298 K for the following reactions : "C(graphite)" + O_(2)(g) rarr CO_(2)(g) , Delta H = -393.5 kJ//mol H_(2)(g) + (1)/(2)O_(2)(g) rarr H_(2)O(l) , Delta_(f)H^(@) = -285.8 kJ//mol CO_(2)(g) + 2H_(2)O(l) rarr CH_(4)(g) + 2O_(2)(g) , Delta_(f)H^(@) = +890.3 kJ//mol

How many electrons are present in 16 g of CH_(4) ?

MODERN PUBLICATION-MOCK TEST PAPER - 1-MCQs
  1. The dipole moment of is 1.5D. The dipole moment of is :

    Text Solution

    |

  2. 300 mL of gas at 27^@C is cooled to 10^@C at constant pressure, the fi...

    Text Solution

    |

  3. The bond dissociation energy of C-H in CH4 from the equation C(g) + ...

    Text Solution

    |

  4. The formation of O^(2-)(g) startng from O(g) is endothermic by 603 kJ ...

    Text Solution

    |

  5. AgCl dissolves in NH(4)OH due to the formation of :

    Text Solution

    |

  6. Plexiglass is a commercial name of :

    Text Solution

    |

  7. Which of the following alloys is used for making clock pendulums ?

    Text Solution

    |

  8. In which of the following reaction Kp and Kc are equal :

    Text Solution

    |

  9. In the redox reaction : KMnO4 + NH3 to KNO3 + MnO2 + KOH + H2O t...

    Text Solution

    |

  10. Rosenmund reduction of acyl chloride gives :

    Text Solution

    |

  11. Which of the following will be most redily dehydrated in acidic condit...

    Text Solution

    |

  12. Electron deficient molecular hydride is

    Text Solution

    |

  13. Which of the following alkali metal halides has the lowest lattice ene...

    Text Solution

    |

  14. When iodoform is treated with sliver powder it forms :

    Text Solution

    |

  15. In the reaction sequence, CH2 = CH2 overset(HOCl)to X overset(Y)to ...

    Text Solution

    |

  16. Which of the following cannot act as Lewis acid?

    Text Solution

    |

  17. Of the five isomeric hexanes, the isomer which can give two monochlori...

    Text Solution

    |

  18. In the reaction C6H6 + CO + HCl underset(AlCl3)overset("anhyd")to X...

    Text Solution

    |

  19. When m - chlorobenzaldehyde is treated with KOH solution, the product ...

    Text Solution

    |

  20. Dettol is a mixture of chloroxylenol and :

    Text Solution

    |