Home
Class 11
CHEMISTRY
The enthalpy change for the transiton o...

The enthalpy change for the transiton of liquid water to steam is 40.8 kj `mol^(-1)` at 373 K. Calculate the entropy change for the process.

Text Solution

Verified by Experts

`H_(2)O(l) to H_(2) O(g)`
Given, `Delta H = 40.8 kj mol^(-1) , T = 373 k`
`Delta S = (Delta H)/(T) = (40.8 xx 10^(3) j mol^(-1))/(373) = 109.4 jK^(-1)`
Promotional Banner

Topper's Solved these Questions

  • THERMODYNAMICS

    OMEGA PUBLICATION|Exercise MULTIPLE CHOICE QUESTIONS (MCQ)|25 Videos

  • THE S-BLOCK ELEMENTS

    OMEGA PUBLICATION|Exercise MULTIPLE CHOICE QUESTIONS MCQ.s|26 Videos

Similar Questions

Explore conceptually related problems

The enthalpy change for the reaction N2(g) + 3 H2(g) → 2 NH3(g) is -91.8 kJ at 298 K. Calculate the enthalpy of formation of ammonia?

The activation energy of a first order reaction at 300 K is 60 kJ mol^-1 . In the Presence of a Catalyst, the activation energy gets lowered to 50 kJ mol^-1 at 300 K. How many times the reaction rate changes in the Presence of a catalyst at the same temperature ?

Molar heat capacities at constant pressure for A, B and C are 3, 1.5 and 2 J/K mol. The enthalpy of reaction and entropy of reaction, A + B rarr 3C are 20 kJ/mol and 20 J/K mol at 300 K. Calculate DeltaG (in kJ / mol) for the reaction, (1)/(2)A+Brarr(3)/(2)C

The enthalpy change for the following reaction is 368 kJ. Calculate the average O-F bond energy. OF_(2)(g)rarrO(g)+2F(g)

Enthalpy of combustion of carbon to CO_(2) is - 393.5 kj mol^(-1) . Calculate the heat released upon formation of 35.2 g of CO_(2) from carbon and dioxygen gas.

Two reactions of the same order have equal pre-exponential factors but their activation energies difter by 24.9 kJ mol^-1 . Calculate the ratio between the rate constants of these reactions at 27^@C . (Gas constant, R= 8.3 JK^-1 mol^-1 ).

The rate of a reaction increases four times when the temperature changes from 300 K to 320 K. Calculate the energy of activation of the reaction assuming that it does not change with temperature (R = 8.314 JK^-1 mol^-1) .

The standard enthalpy of formation of gaseous H_(2)O at 298 K is -241.82 kJ/mol. Calculate DeltaH^(@) at 373 K given the following values of the molar heat capacities at constant pressure : H_(2)O(g)=33.58 " JK"^(-1)" mol"^(-1), " "H_(2)(g)=29.84 " JK"^(-1)" mol"^(-1), " "O_(2)(g)=29.37 " JK"^(-1)" mol"^(-1) Assume that the heat capacities are independent of temperature :

The rate of reaction becomes four times when the temperature changes from 293 K to 313 K. Calculate the energy of activation (E _(a)) of the reacton assuming that it does not change with temperature. [ R = 8.314 J K ^(-1) mol ^(-1), log 4 = 0. 6021]

OMEGA PUBLICATION-THERMODYNAMICS-MULTIPLE CHOICE QUESTIONS (MCQ)
  1. The enthalpy change for the transiton of liquid water to steam is 40....

    Text Solution

    |

  2. The intensive property among these quantities is

    Text Solution

    |

  3. Identify the extensive property among the followings

    Text Solution

    |

  4. An adiabatic expansion of an ideal gas always has

    Text Solution

    |

  5. During isothermal expansion of an ideal gas, its

    Text Solution

    |

  6. Enthalpy of a reaction Delta H is expressed as

    Text Solution

    |

  7. The heat required to raise the temperature of a body by 1C degree is c...

    Text Solution

    |

  8. According to the second law of thermodynamics , a process (reaction is...

    Text Solution

    |

  9. Considering entropy (S) as a thermodynamic parameter the criterion fo...

    Text Solution

    |

  10. Delta G = Delta H - T Delta S was given by

    Text Solution

    |

  11. What is pistil?

    Text Solution

    |

  12. The occurrence of reaction is impossible if

    Text Solution

    |

  13. One calorie is equivalent to

    Text Solution

    |

  14. For an adiabatic proces which of the following relations is correct ?

    Text Solution

    |

  15. For the reactions : C(s) + O(2) (g) to CO(2) (g)

    Text Solution

    |

  16. For the reaction : C(3)H(8)(g) + 5O(2) (g) to 3 CO(2) (g) + 4H(2) O...

    Text Solution

    |

  17. Which one of the following expressions represents the first law of the...

    Text Solution

    |

  18. For a reaction N(2(g)) + 3H(2(g)) hArr 2NH(3(g))

    Text Solution

    |

  19. What do mean by the term- Weed?

    Text Solution

    |

  20. What are trees? Give two examples?

    Text Solution

    |

  21. For a reversible process at equilibrium, the change in entropy may be ...

    Text Solution

    |