Home
Class 11
CHEMISTRY
Heat of reaction (DeltaH) is given by...

Heat of reaction `(DeltaH)` is given by

A

`DeltaH=(E_(a))_(f)-(E_(a))_(b)`

B

`DeltaH=BE_(R)-BE_(P)`

C

`DeltaH=H_(P)-H_(R)`

D

All the above

Text Solution

Verified by Experts

The correct Answer is:
D
Standard definition
Promotional Banner

Topper's Solved these Questions

  • THERMODYNAMICS

    NARAYNA|Exercise Level -III|64 Videos

  • THERMODYNAMICS

    NARAYNA|Exercise Level-IV|27 Videos

  • THERMODYNAMICS

    NARAYNA|Exercise Level -I (C.W)|62 Videos

  • STRUCTURE OF ATOM

    NARAYNA|Exercise EXERCISE - IV EXEMPLAR PROBLEMS|24 Videos

Similar Questions

Explore conceptually related problems

For which of the following reactions heat of formation (Delta_(f)H) is equal to DeltaH//2 ?

Heat of reaction is the change in enthalpy or internal energy as represented by a balanced thermochemical equation . The amount of energy released during a chemical change depends upon the state of reactants and products, the conditions of pressure and volume at which reaction is carried out, and temperature. The variation of heat of reaction (DeltaH_(1) or DeltaE) with temperature is given as DeltaH_(2)-DeltaH_(1)=DeltaC_(P)[T_(2)-T_(1)] or DeltaE_(2)-DeltaE_(1)=DeltaC_(v)(T_(2)-T_(1). Standard heat enthalpy of elements in their most stable state is assumed to be zero whereas standard heat enthalpy of compound is referred as heat of formation of that compound at 1 atm pressure and 25^(@)C . Oxidation of N_(2) to N_(2)O,NO,NO_(2) shows absorption of energy whereas heat of combustion of N_(2) is exothermic like other heat of combustion. Standard heat enthalpy has been assumed to be zero for :

For a chemical reaction, DeltaH is negative and DeltaS is negative and DeltaS is negative . This reaction is

If DeltaH_(f)(X) , DeltaH_(f)(Y) , DeltaH_(f)(R ) and DeltaH_(f)(S) denote the enthalpies of formation of X , Y , R and S respectively, the enthalpy of the reaction X+YtoR+S is given by

Enthalpy of reaction DeltaH is expressed as

For the reaction H_(2)+I_(2)hArr2NHI , DeltaH=12.40 kcal . The heat of formation (DeltaH) of HI is

For an edothemic reaction, DeltaH is positive.

NARAYNA-THERMODYNAMICS-Level -II (C.W)
  1. The stadard heats of formation of NO(2)(g) and N(2)O(4) (g) are 33.5 a...

    Text Solution

    |

  2. The enthalpies of formation of CO(2(g)), H(2)O((l)) and C(2)H(4(g)) ar...

    Text Solution

    |

  3. If H(2)S+3/2 O(2) rarr H(2)O+SO(2), DeltaH=-136.7 Kcal H(2)+1/2 O(...

    Text Solution

    |

  4. A+3/2 O(2) rarr AO(3) = 3x KJ AO(2)+1/2 O(2) rarr AO(3) = 2y kJ Th...

    Text Solution

    |

  5. The enthalpy change during the formation of 24.95 grams of hydrated co...

    Text Solution

    |

  6. The molar enthalpies of combustion of C(2)H(2)(g), C("graphite") and H...

    Text Solution

    |

  7. For a given reaction, C(7)H(8(l))+9I(2) (g) rarr 7CO(2)(g) +4H(2)O(l...

    Text Solution

    |

  8. Hess's law states that

    Text Solution

    |

  9. Heat of reaction (DeltaH) is given by

    Text Solution

    |

  10. The values of the combustion of graphite and H(2) are -395 and -269 kJ...

    Text Solution

    |

  11. The heat of combustion of sucrose C(12) H(22) O(11)(s) at constant vol...

    Text Solution

    |

  12. At 298 K, the heat of solution of MgSO(4) (s) is -91.21 kJ mol^(-1) an...

    Text Solution

    |

  13. The entropy change for cooling 1.6 g of an organic compound (mol. Wt. ...

    Text Solution

    |

  14. The entropy change during heating of 50 g water (sp. Heat =4200 J kg^(...

    Text Solution

    |

  15. Standard molar entropies of Mg((s)), C((s)), MgO((s)) & CO((g)) respec...

    Text Solution

    |

  16. The value DeltaS for the process H(2)O(s) rarr H(2)O(l) at 1 atm pre...

    Text Solution

    |

  17. On the basis of information available from the reaction (4)/(3)Al+O(...

    Text Solution

    |

  18. Consider the following reactions at 1000^(@)C. (A) Zn((s))+1/2 O(2(g...

    Text Solution

    |

  19. Acetic acid forms dimer in vapour phase. The dimer is held together by...

    Text Solution

    |

  20. The temperature in K at which DeltaG=0 for a given reaction with Delta...

    Text Solution

    |