Home
Class 11
CHEMISTRY
The reaction, H(2(g)) + 1/2O(2(g)) to H2...

The reaction, `H_(2(g)) + 1/2O_(2(g)) to H_2O_((l))`, is spontaneous. The `DeltaS^(@) = - 163.1 J mol^(-1) K^(-1)`. The absolute entropies of `H_(2(g)) and O_(2(g))` are `130.6 JK^(-1)mol^(-1)` and `205 JK^(-1) mol^(-1)` respectively. Calculate the absolute entropy of water. 

Text Solution

Verified by Experts

Change in standard entropy,
`DeltaS ^(@)=S_(H_2O_((l)))^(@)-[S_(H_(2))^(@)+1/2S_(O_2)^(@)]`
`163.1Jmol^(-1)K^(-1)=S_(H_(2)O_((l)))^(@)-[130.9+205/2]`
Absolute entropy of water =`69.9Jk^(-1)mol^(-1)`.
Promotional Banner

Topper's Solved these Questions

  • CHEMICAL THERMODYANMICS

    AAKASH SERIES|Exercise Exercise 3.1.1|8 Videos

  • CHEMICAL THERMODYANMICS

    AAKASH SERIES|Exercise Exercise 3.1.2|12 Videos

  • CHEMICAL EQUILIBRIUM

    AAKASH SERIES|Exercise QUESTIONS FOR DESCRIPTIVE ANSWERS|30 Videos

  • CHEMICAL THERMODYNAMICS

    AAKASH SERIES|Exercise PRACTICE EXERCISE|50 Videos

Similar Questions

Explore conceptually related problems

The absolute entropies of H_(2(g)), O_(2(g)) and H_2O_((l)) are respectively 130.6, 205.1 and 69.9 JK-mol^(-1) . Calculate the value of DeltaS for the formation of one mole liquid water.

For the reaction 2H_(2(g)) + o_(2(g)) rarr 2H_(2)O_((g)), Delta H^(@) = - 573.2 kJ . The heat of decomposition of water per mol is:

The heats of formation of CO_(2(g)) , H_2O_((l)) and CH_(4(g)) are respectively –394 kJ mol^(-1), -286 kJ mol^(-1) and -76 kJ mol^(-1) . Calculate the heat of combustion of methane.

The enthalpy of the reaction H _(2 (g)) + 1/2 O _(2(g)) to H _(2) O _((g)) is Delta H _(1) and that of H _(2(g)) + 1/2 O _(2(g)) to H _(2) O _((l)) is Delta H _(2). Then

One mole of ice is converted into water at 273 K. The entropies of H_2O_((s)) and H_2O_((l)) are 38.20 and 60.01 J mol^(-1)K^(-1) respectively. The enthalpy change for the conversion is

For a cell reaction 2H_(2(g)) + O_(2(g)) to 2H_2O_((l)) DeltaS_(298)^(@) = - 0.32 kJ // K . What is the value Delta_(i) H_(298)^(@) (H_2O, l) ? Given : O_(2(g)) + 4H_((aq))^(+) + 4e^(-) to 2H_2O_((l)) , E^(@) = 1.23 V

S_(H_(2(g)))^(0) = 130.6 JK^(-1) mol^(-1), S_(H_(2)O_((l)))^(0) = 69.9JK^(-1) mol^(-1), S_(O_(2(g)))^(0) = 205 JK^(-1) , Then the absolute entropy change of H_(2(g)) + (1)/(2)O_(2(g)) rarr H_(2)O_((l)) is

AAKASH SERIES-CHEMICAL THERMODYANMICS -Questions For Descriptive Answers
  1. The reaction, H(2(g)) + 1/2O(2(g)) to H2O((l)), is spontaneous. The De...

    Text Solution

    |

  2. How does heat of neutralisation value change with the chemical nature ...

    Text Solution

    |

  3. How does entropy changes with the transformation at different temperat...

    Text Solution

    |

  4. At 400K, 5 moles of an ideal gas expands isothermally and reversibly f...

    Text Solution

    |

  5. The molar heat capacity at constant volume of a system is 12.41J. mol^...

    Text Solution

    |

  6. Enthalpy of ammonia and water are -46.19KJ.mol^(-1) and -285.9KJ.mol^(...

    Text Solution

    |

  7. H(2)+Cl(2)to 2HCl,Delta H(1), ...

    Text Solution

    |

  8. The heat of combustion a sugar is -790KJmol^(-1). A person requires 23...

    Text Solution

    |

  9. Given that bond energies of N=N,H-H and N-H bonds as 945, 436 and 391 ...

    Text Solution

    |

  10. At constant pressure, the heat of combustion of carbon monoxide at 17^...

    Text Solution

    |

  11. What is the work done in a open vessel at 27^(@)C, when 92 grams of so...

    Text Solution

    |

  12. Certain amount of argon at 1 atm and 300 K expands reversibly and adia...

    Text Solution

    |

  13. In an insulated container, 1 mole of a liquid of molar volume 100 mL i...

    Text Solution

    |

  14. HCI is a strong acid, but HF is a weak acid. The enthalpy of neutralis...

    Text Solution

    |

  15. The enthalpy of vapourisation of water is 37.3 kl mol^(-1). Calculate...

    Text Solution

    |

  16. The standard enthalpy of hydrogenation of cyclohexene is119 kJmol^(-1)...

    Text Solution

    |

  17. Calculate the number of calories of energy released when 1 L of HCI is...

    Text Solution

    |

  18. Heats of atomisation of NH(3) and NH(2)H(4) are xKJmol^(-1)" and "yKJm...

    Text Solution

    |

  19. Standard enthalpies of C(6)H(6)(l),H(2)O(g) " and "CO(2)(g) are respec...

    Text Solution

    |

  20. Heat of formation of water and heats of combustion of ethylene and ace...

    Text Solution

    |

  21. At 427^@C, for a given change the values of DeltaG and DeltaH are -11,...

    Text Solution

    |