Home
Class 11
CHEMISTRY
Two reactions are given below: (i) H(2...

Two reactions are given below`:`
(i) `H_(2)O(g)+(1)/(2)O_(2)(g) rarrH_(2)O(l)`
(ii) `H_(2)(g)+(1)/(2)O_(2)(g) rarr H_(2)O(g)`
Which one will have greater value of `DeltaH` and why ?

A

`Delta H_(1) lt Delta H_(2)`

B

`Delta H_(1) + Delta H_(2)= 0`

C

`Delta H_(1) gt Delta H_(2)`

D

`Delta H_(1)= Delta H_(2)`

Text Solution

Verified by Experts

The correct Answer is:
A
For reaction (i) `Delta n_(1)= 0.5`
For reaction (ii) `Delta n_(2)= 1.5`
So, `Delta H_(1) lt Delta H_(2)`
Promotional Banner

Topper's Solved these Questions

  • THERMODYNAMICS AND THERMOCHEMISTRY

    ERRORLESS|Exercise NCERT Based Questions (Bond Energy)|15 Videos

  • THERMODYNAMICS AND THERMOCHEMISTRY

    ERRORLESS|Exercise NCERT Based Questions (Free Energy and Work Function) |37 Videos

  • THERMODYNAMICS AND THERMOCHEMISTRY

    ERRORLESS|Exercise NCERT Based Questions (IInd & IIIrd Law of Thermodynamics and Entropy)|41 Videos

  • THE S-BLOCK ELEMENTS

    ERRORLESS|Exercise Assertion & Reason|10 Videos

Similar Questions

Explore conceptually related problems

H_(2)(g)+(1)/(2)O_(2)(g)rarr2H_(2)O(l), DeltaH =- 286 kJ 2H_(2)(g)+O_(2)(g)rarr2H_(2)O(l)……………kJ(+-?)

For the two equations given below: H_(2)(g)+1//2O_(2)(g)toH_(2)O(l)+x_(1)kJ H_(2)(g)+1//2O_(2)(g)toH_(2)O(g)+x_(2)kJ Select the correct answer:

H_(2)O(g)+(1)/(2)O_(2)(g)toH_(2)O(g)," "DeltaH=x H_(2)(g)+(1)/(2)O_(2)(g)toH_(2)O(l)," "DeltaH=y heat of vaporization of water is:

The enthalpy of the reaction H_(2)(g)+(1)/(2)O_(2)(g)toH_(2)O(g) is DeltaH_(1) and that of H_(2)(g)+(1)/(2)O_(2)(g)toH_(2)O(l) is DeltaH_(2) . Then

Given that: i. C(s) + O_(2)(g) rarr CO_(2)(g) , DeltaH =- 94.05 kcal ii. H_(2)(g) +(1)/(2) O_(2)(g) rarr H_(2)O(l), DeltaH =- 68.32 kcal iii. C_(2)H_(2)(g) +(5)/(2) O_(2)(g) rarr 2CO_(2)(g) +H_(2)O(l),DeltaH =- 310.62 kcal The heat of formation fo acetylene is

Calculate the enthalpy of vaporisation for water form the following: H_(2)(g) +1//2O_(2)(g) rarr H_(2)O(g),DeltaH =- 57.0 kcal H_(2)(g) +1//2O_(2)(g) rarr H_(2)O(l),DeltaH =- 68.3 kcal Also calculate the heat required to change 1g H_(2)O(l) to H_(2)O(g)

ERRORLESS-THERMODYNAMICS AND THERMOCHEMISTRY-NCERT Based Questions (Heat of Reaction)
  1. In the complete combustion of butanol C(4)H(9)OH(l), if Delta H is ent...

    Text Solution

    |

  2. Which compound will absorb the maximum amount of heat when dissolved i...

    Text Solution

    |

  3. Which one of the following is always not negative

    Text Solution

    |

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

    Text Solution

    |

  5. NH(3)(g) + 3Cl(2)(g) rarr NCl(3)(g) + 3HCl(g), " "DeltaH(1) N(...

    Text Solution

    |

  6. The lattice enthalpy and hydration enthalpy of four compounds are give...

    Text Solution

    |

  7. For an endothermic reaction, where Delta H represents the enthalpy of ...

    Text Solution

    |

  8. A Beckmann thermometer is used to measure

    Text Solution

    |

  9. The heat liberated when 1.89 g of benzoic acid is burnt in a bomb calo...

    Text Solution

    |

  10. The standard enthalpies of formation of A(NH(3)),B(CO(2)),C(HI) and D(...

    Text Solution

    |

  11. C("graphite")+O(2)(g)rarrCO(2)(g) deltaH=-94.05Kcalmol^(-1) C("dia...

    Text Solution

    |

  12. When 50 cm^(3) of 0.2 N H(2)SO(4) is mixed with 50 cm^(3) of 1 N KOH, ...

    Text Solution

    |

  13. The amount of heat evolved when 500 cm^(3) 0.1 M HCl is mixed with 200...

    Text Solution

    |

  14. Two reactions are given below: (i) H(2)O(g)+(1)/(2)O(2)(g) rarrH(2)O...

    Text Solution

    |

  15. The enthalpy of elements in their standard atates are taken as zero .T...

    Text Solution

    |

  16. The heat of combustion of carbon is -94 kcal at 1 atm pressure. The in...

    Text Solution

    |

  17. When 100 ml of 0.2 M HCl is mixed with 100 ml of 0.2 M NaOH, the rise ...

    Text Solution

    |

  18. When 50 cm^(3) of a strong acid is added to of an alkali, the temperat...

    Text Solution

    |

  19. The enthalpy of neutralization of oxalic acid by strong acid is - 25.4...

    Text Solution

    |

  20. Which of the following salt on dissolution in water absorbs heat

    Text Solution

    |