Home
Class 12
CHEMISTRY
If DeltaH is the change in enthylpy and ...

If `DeltaH` is the change in enthylpy and `DeltaU`, the change in internal energy accompanying a gaseous reactant then

A

`DeltaH` is always greaer than `DeltaE`

B

`DeltaHltDeltaE` only if the number of moles of the produce is greater than the number of moles of the reactants

C

`DeltaH` is a always less than `DeltaE`

D

`DeltaHltDeltaE` only if the number of moles of products is less than the number of moles of the reactants.

Text Solution

Verified by Experts

The correct Answer is:
D
As `DeltaH=DeltaE=Deltan_(g)RT`
If `n_(p)ltn_(r),Deltan_(g)=n_(p)-n_(r)=-ve`
Hence `DeltaHltDeltaE`
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

If Delta H is the change in enthalpy and Delta U the change in internal energy accompanying a gaseous reaction (A) Delta H is always greater than Delta U (B) Delta H < Delta U only if the number of moles of the products is greater than the number of the reactants (C) Delta H is always less than Delta U (D) Delta H < Delta U only if the number of moles of the products is less than the number of the reactants

If DeltaH is the enthalpy change and DeltaU the change in internal energy accompanying a gaseous reaction, then

If DeltaH is the change in enthalpy and DeltaE the change in internal energy for a gaseous reaction then

DISHA PUBLICATION-THERMODYNAMICS-Exercise
  1. A sample of liquid in a thermally insulated constant ( a calorimetre...

    Text Solution

    |

  2. For a reversible adiabatic ideal gas expansion (dp)/(p) is equal to

    Text Solution

    |

  3. If DeltaH is the change in enthylpy and DeltaU, the change in internal...

    Text Solution

    |

  4. The molar heat capacity of water at constant pressure P , is 75JK^(-1)...

    Text Solution

    |

  5. The enthalpy change for a reaction does not depend upon:

    Text Solution

    |

  6. Consider the reaction, N(2) + 3H(2) rarr 2NH(3) carried out at consta...

    Text Solution

    |

  7. Standard enthalpies of formation of O(3),CO(3),NH(3) and HI are 142.2,...

    Text Solution

    |

  8. The heat of combustion of carbon to CO(2)is-395.5kJ//mol.The heat rele...

    Text Solution

    |

  9. The DeltaH(f)^(@) for CO(2)(g), CO(g) and H(2)O(g) are -395.5,-110.5 a...

    Text Solution

    |

  10. The enthalpies of formation of Al(2)O(3) and Cr(2)O(3) are -1596KJ and...

    Text Solution

    |

  11. Equal volumes of molar hydrochloric acid and sulphuric acid are neutra...

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |