Home
Class 12
CHEMISTRY
For the reaction : F(2)(g) + 2HCl(g) h...

For the reaction :
`F_(2)(g) + 2HCl(g) hArr 2HF(g) + Cl_(2)(g)`
`Delta H^(theta)` at `25^(@)C` is `=-84.4 kcalmol^(-1)`
`Delta_(f) H^(theta)(HF) = -64.2kcalmol^(-1)`
`Delta_(f) H^(theta)` for HCl(g) per gram is :

A

`- 0.603 kcalg^(-1)`

B

`0.603 kcalg^(-1)`

C

`0.0603 kcalg^(-1)`

D

`6.03 kcalg^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
A
`Delta H = 2 Delta H_(f) [HF(g)] + Delta H_(f)(Cl_(2)) - 2 Delta H_(f) [HCl(g)] - Delta H_(f)(F_(2))`
`- 84.4 = 2 xx (-64.2) - 0 - 2 Delta H_(f) [HCl(g)] - 0`
`2 Delta H_(f)[HCl(g)] = - 128.4 + 84.4 = - 44.0 kcal`
`Delta H_(f) [HCl(g)] = - 22.0 kcal`
`Delta H_(f)^(@)` for HCl per gram `= (-22.0)/(36.5)`
`= - 0.603 kcal`
Promotional Banner

Topper's Solved these Questions

  • THERMODYNAMICS

    MODERN PUBLICATION|Exercise Multiple Choice Questions (Level-III)|10 Videos

  • THERMODYNAMICS

    MODERN PUBLICATION|Exercise Recent Examination Question|15 Videos

  • THERMODYNAMICS

    MODERN PUBLICATION|Exercise Recent Examination Question|15 Videos

  • THE SOLID STATE

    MODERN PUBLICATION|Exercise RECENT EXAMINATION QUESTIONS|11 Videos

  • UNIT TEST - 3

    MODERN PUBLICATION|Exercise MULTIPLE CHOICE QUESTIONS|59 Videos

Similar Questions

Explore conceptually related problems

For the reaction : CO(g)+2H_(2)(g)hArr CH_(3)OH(g)

For the equilibrium reaction H_(2(g))+I_(2(g))hArr 2HI_((g))

For the reaction, 2H_(2)O(g) rarr 2H_(2)(g) + O_(2)(g), Delta H = 571.6 kJ Delta_(f) H^(theta) of water is:

In the reaction : CO_(2)(g) + H_(2)(g) hArr CO(g) + H_(2)O(g) , Delta H = 2.8 kJ . Delta H represents

Calculate the heat required to make 6.4 kg of CaC_(2) from CaO(s) and C(s) from the reaction : CaO(s) + 3 C(s) rarr CaCl_(2)(s) + CO(g) given that Delta_(f)H^(theta) (CaO) = - 151.6 kcal . Delta_(f)H^(theta) (CaC_(2)) = - 14.2 kcal . Delta_(f)H^(theta) (CO) = - 26.4 kcal

For the reaction : CO(g)+Cl_(2)(g)hArr COCl_(2)(g) the K_(p)//K_(c ) is equal to :

For the reaction, C_(2) H_(4) (g) + 3O(2) (g) to 2 CO_(2) (g) + 2H_(2) O(I), Delta E = -1415 KJ. then Delta H at 27^(@) C is

For the reaction : H_(2)(g) + (1)/(2)O_(2)(g) rarr H_(2)O(l), Delta H = - 68 kcalmol^(-1) The heat change for the decomposition of 7.2 g of water is

Calculate the heat of reaction of the following reaction : CO_(2)(g) + H_(2)(g) rarr CO(g) + H_(2)O(g) Given that the Delta_(f)H^(@) of CO(g) = -110.5 kJ, Delta_(f)H^(@) of CO_(2)(g) = -393.8 kJ , Delta_(f)H^(@) of H_(2)O(g) = -241.8 kJ respectively

MODERN PUBLICATION-THERMODYNAMICS-Multiple Choice Questions (Level-II)
  1. Two objects are said to be in thermal equilibrium if they have same

    Text Solution

    |

  2. An isolated system is that system in which

    Text Solution

    |

  3. For the reaction : F(2)(g) + 2HCl(g) hArr 2HF(g) + Cl(2)(g) Delta ...

    Text Solution

    |

  4. M is a metal which forms an oxide, M(2)O and (1)/(2) M(2)O(s) rarr M(s...

    Text Solution

    |

  5. A mixture of 2 moles of carbon monoxide and one mole of oxygen in a cl...

    Text Solution

    |

  6. Latent heat of vaporisation of a liquid at 500 K and 1 atm pressure is...

    Text Solution

    |

  7. At constant T and P which one of the following statements is correct f...

    Text Solution

    |

  8. If S + O(2) rarr SO(2), Delta H = -298.2 kJ SO(2) + (1)/(2) O(2) rar...

    Text Solution

    |

  9. The latent heat of vaporisation of water at 100^(@) is 2257 (kJ)/(kg)....

    Text Solution

    |

  10. If Delta H and Delta U are the changes in the enthalpy and internal en...

    Text Solution

    |

  11. One mole of methannol when burnt in oxygen gives out 723 kJ mol^(-1) h...

    Text Solution

    |

  12. S + (3)/(2)O(2) rarr SO(3) + 2x kcal SO(2) + (1)/(2) O(2) rarr SO(3)...

    Text Solution

    |

  13. The enthalpy of formation of two compounds A and B are -84 kJ and -156...

    Text Solution

    |

  14. For a reaction at equilibrium, the partial pressure of B is found to b...

    Text Solution

    |

  15. When an ideal gas is suddenly allowed to expand adiabatically into an ...

    Text Solution

    |

  16. In which case of mixing of a strong acid and a strong base each of 1 M...

    Text Solution

    |

  17. The dissociation energy of CH(4) and C(2)H(6) are respectively 1508 an...

    Text Solution

    |

  18. Standard heat of formation of CH(4).CO(2) and H(2)O (l) are - 76.2, -3...

    Text Solution

    |

  19. Standard molar enthalpy of formation of CO(2) is equal to

    Text Solution

    |

  20. The enthalpy change in freezing 1 g of water (Delta H "fusion "= 6.0 ...

    Text Solution

    |