Home
Class 12
CHEMISTRY
The enthalpy of vapourisation of liquid ...

The enthalpy of vapourisation of liquid water using the data :
`H_(2)(g)+1//2O_(2)(g)rarr H_(2)O(l) , Delta =-285.77 KJ mol^(-1)`
`H_(2)(g)+1//2O_(2)(g)rarr H_(2)O(g) , Delta H=-241.84 KJ mol^(-1)`

A

`+43.93` KJ `mol^(-1)`

B

`-43.93` KJ `mol^(-1)`

C

`+527.61` KJ `mol^(-1)`

D

`-527.61` KJ `mol^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
A
`H_(2)O_((l))rarr H_(2)O_((g)) , Delta H_("Vap.")= ?`
Desired equation = eq(ii) - eq(i)
`Delta H_("Vap.") =(-241.84)-(-285.77)`
`Delta H_("Vap.")=+43.93 KJ mol^(-1)`
Promotional Banner

Topper's Solved these Questions

  • THERMODYNAMICS

    ALLEN|Exercise EXERCISE -4|18 Videos

  • THERMODYNAMICS

    ALLEN|Exercise EXERCISE -2|100 Videos

  • TEST PAPERS

    ALLEN|Exercise CHEMISTRY|19 Videos

  • Thermodynamics And Thermo Chemistry

    ALLEN|Exercise All Questions|39 Videos

Similar Questions

Explore conceptually related problems

The enthalpy of vaporisation of liquid water using the data H_(2)(g)+(1)/(2)O_(2)(g)toH_(2)O(l) , DeltaH=-285.77 kJ//mol H_(2)(g)+(1)/(2)O_(2)(g)toH_(2)O(g) , DeltaH=-241.84 kJ//mol

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(+-?)

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)

Calculate the standard enthalpy of formation of acetylene from the following data : C_((g))+O_(2(g))rarr CO_(2(g)),DeltaH^(@)=-393kJ mol^(-1) H_(2(g))+(1)/(2)O_(2(g)) rarr H_(2)O_((l)),DeltaH^(@)=-285.8kJ mol^(-1) 2C_(2)H_(2(g))+5O_(2(g))rarr 4CO_(2(g))+2H_(2)O_((l)),DeltaH^(@)=-2598.8kJ mol^(-1) .

ALLEN-THERMODYNAMICS -EXERCISE -3
  1. Given that , A(s) rarr A(l)DeltaH=x A(l) rarr A(g), DeltaH=y The...

    Text Solution

    |

  2. The enthalpy change of a reaction does not depend on

    Text Solution

    |

  3. From the thermochemical reactions, C(graphite)+1//2O(2)rarr CO , Delta...

    Text Solution

    |

  4. If H(2)+1//2O(2)rarr H(2)O , Delta =-68.39 Kcal K+H(2)O+ "water" rar...

    Text Solution

    |

  5. Given C(s)+O(2)(g)rarr CO(2)(g)+94.2 Kcal H(2)(g)+2O(2)(g)rarr CO(2)...

    Text Solution

    |

  6. From the following data, the heat of formation of Ca(OH)(2)(s) at 18^(...

    Text Solution

    |

  7. If, H(2)(g)+Cl(2)(g)rarr 2HCl(g) , Delta H^(@)=-44 Kcal 2Na(s)+2HCl...

    Text Solution

    |

  8. Given : S((s))+(3)/(2)O(2(g))rarrSO(3(g)+2X Kcal SO(2(s))+(1)/(2)O(2...

    Text Solution

    |

  9. If S +O(2) rarr SO(2), DeltaH =- 298.2 kJ SO(2)+1//2O(2) rarr SO(3),...

    Text Solution

    |

  10. Givecn that : Zn+1//2O(2)rarr ZnO+84000 cal ……………1 Hg+1//2O(2)rarr...

    Text Solution

    |

  11. Given that - 2C(s)+2O(2)(g)rarr 2CO(2)(g) Delta H = -787 KJ H(2)(g...

    Text Solution

    |

  12. Find the heat change in the reaction : NH(3)(g)+HCl(g)rarr NH(4)Cl(s) ...

    Text Solution

    |

  13. The heat of reaction of A+(1)/(2)O(2)rarr AO is -50 K call and AO+...

    Text Solution

    |

  14. C(s)+O(2)(g)rarr CO(2)(g)+94.0 K cal. CO(g)+(1)/(2)O(2)(g)rarr CO(2)...

    Text Solution

    |

  15. Using the following thermochemical data. C(S)+O(2)(g)rarr CO(2)(g), ...

    Text Solution

    |

  16. The enthalpy of vapourisation of liquid water using the data : H(2)(...

    Text Solution

    |

  17. H(2)(g)+1//2O(2)(g)=H(2)O(l) , Delta H(298 K)=-68.32 Kcal. Heat of vap...

    Text Solution

    |

  18. The heat of solution of anhydrous CuSO(4) and CuSO(4).5H(2)O are -15.8...

    Text Solution

    |

  19. One moles of anhydrous AB dissolves in water and liberates 21.0 J mol^...

    Text Solution

    |

  20. Which of the following expression is true :-

    Text Solution

    |