Home
Class 12
CHEMISTRY
Delta(f)U^(ө) for the formation of CH(4)...

`Delta_(f)U^(ө)` for the formation of `CH_(4)(g)` at certain temperature is -393 kJ `mol^(-1)`. The value of `Delta_(f)H^(ө)` is

A

zero

B

`lt Delta_(f)U^(ө)`

C

`gtDelta_(f) U^(ө)`

D

equal to `Delta_(f)U^(ө)`

Text Solution

Verified by Experts

The correct Answer is:
B
`CH_(4)(g)+2O_(2)(g)toCO_(2)(g)+2H_(2)O(l)`
`Deltan_(g)=(n_(p)-n_(r))=1-3=-2`
`Delta_(f)H^(ө)=Delta_(f)U^(ө)+Deltan_(g)RT`
`Deltan_(g)=2Delta_(f)H^(ө) lt Delta_(f) U^(ө)`
Promotional Banner

Topper's Solved these Questions

  • CHEMICAL THERMODYNAMICS AND ENERGETIC

    MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS|Exercise MHT CET Corner|40 Videos

  • CHEMICAL THERMODYNAMICS AND ENERGETIC

    MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS|Exercise Exercise 1|88 Videos

  • CHEMICAL KINETICS

    MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS|Exercise MHT CET CORNER|20 Videos

  • CHEMISTRY IN EVERYDAY LIFE

    MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS|Exercise MHT CET CORNER|11 Videos

Similar Questions

Explore conceptually related problems

delta_(f) U^(Ө) "of formation of" CH_(4)(g) at a certain temperature is -393Jmol^(-1). The value of delta H^(Ө)is:

DeltaU^(@) of combustion of CH_(4(g)) at certain temperature is -"393 kJ mol"^(-1) . The value of DeltaH^(@) is

The enthalpy change for the combustion of N_(2)H_(4)(l) (Hydrazine) is -622.2 kJ mol^(-1) . The products are N_(2)(g) and H_(2)O(l) . If Delta_(f)H^(Theta) for H_(2)O(l) is -285.8 kJ mol^(-1) . The Delta_(f)H^(Theta) for hydrazine is

Enthalpy of formation of NH_(3) is -X kJ and Delta H_(H-H) , Delta H_(N-H) are respectively Y kJ mol^(-1) and Z kj mol^(-1) . The value of Delta H_(N = N) is

The combusition of 1 mol of benzene (C_(6) H_(6)) takes place at 298 K and 1 bar pressure. After combustion, CO_(2) (g) and H_(2) O (1) are produced and 3267 kJ of heat is liberated. Calculate the standard enthaply of formation, Delta_(f) H^(@) of benzene. Standard enthapies of formation of CO_(2) (g) and H_(2) O (1) are - 393.5 kJ mol^(-1) and - 258.83 kJ mol^(-1) , respectively. Strategy : Apply Eq. the mathematical form of Hesis's law, to the combustion reaction of 1 mol of benzene. Remember Delta_(f) H^(@) for O_(2) (g) is zero by convention. We are give Delta_(1) H^(@) and Delta_(f) H^(@) values for all substance except C_(6) H_(6) (1) . We can solve for this unknown.

Consider the reaction Pb O (s) + CO (g) + CO_(2) (g) , Delta_(r)H^(@) = - 65.69 kJ mol^(-1) . If Delta_(f) H^(@) for CO_(2) and CO (g) are 393.5 kJ mol^(-1) and - 110.5 k J mol^(-1) , respectively, calculate Delta_(f) H^(@) for yellow PbO (s)

MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS-CHEMICAL THERMODYNAMICS AND ENERGETIC-Exercise 2
  1. In view of the signs of DeltaG^(ө) for the following reactions, PbO(...

    Text Solution

    |

  2. In an irreversible process taking place at constant T and p and in whi...

    Text Solution

    |

  3. In adiabatic conditions 1 mole of CO(2) gas at 300 K is expanded such ...

    Text Solution

    |

  4. Delta(f)U^(ө) for the formation of CH(4)(g) at certain temperature is ...

    Text Solution

    |

  5. 1.0 mole of a monoatomic ideal gas is expanded from state (I) to state...

    Text Solution

    |

  6. What is the equilibrium constant, K for the following reaction at 400 ...

    Text Solution

    |

  7. Match the columns with the laws of thermodynamics.

    Text Solution

    |

  8. Match the columns with the atomicity of gases to the heat capacity at ...

    Text Solution

    |

  9. An ideal gas is allowed to expand against a constant pressure of 2 bar...

    Text Solution

    |

  10. A sample of 1.0 mole of a monoatomic ideal gas is taken through a proc...

    Text Solution

    |

  11. What would be the heat released when an aqueous solution containing 0....

    Text Solution

    |

  12. The molar heat capacity of water at constant pressure is 75 JK^(-1)mol...

    Text Solution

    |

  13. For a reaction at 25^(@)C, enthalpy and entropy changes are -11.7xx10^...

    Text Solution

    |

  14. The standard molar heat of formation ethane, CO(2) and water (l) are r...

    Text Solution

    |

  15. The DeltaH(f)^(@) of O(3),CO(3),NH(3) and HI are 142.2, -393.3, -46.2 ...

    Text Solution

    |

  16. One molee of methanol when burnt in O(2), gives out 723 kJ mol^(-1) of...

    Text Solution

    |

  17. DeltaH(f)^@ (298K) of methanol is given by the chemical equation,

    Text Solution

    |

  18. Formation of a solution from two components can be considered as (1)...

    Text Solution

    |

  19. If the value of C(p) for nitrogen gas is 7 JK^(-1)mol^(-1), then the v...

    Text Solution

    |

  20. The equilibrium concentration o the species in the reaction A+B hArr C...

    Text Solution

    |