Home
Class 11
CHEMISTRY
At what temperature does the reduction o...

At what temperature does the reduction of lead oxide to lead by carbon becomes spontaneous?
`PbO +C rarr Pb(s) +CO(g)`
For the reacion, `DeltaH` and `DeltaS` at `25^(@)C` are `108.4 kJ mol^(-1)` and `190 J K^(-1) mol^(-1)` respectively.

Text Solution

Verified by Experts

`DeltaG = DeltaH - T DeltaS = 0`
or `T = (DeltaH)/(DeltaS) = (108.4)/(190xx10^(-3) = 570.5K`
Reaction will be spontaneous at temperature higher than `570.5K`,
Promotional Banner

Topper's Solved these Questions

  • THERMODYNAMICS

    CENGAGE CHEMISTRY|Exercise Exercises (Subjective)|70 Videos

  • THERMODYNAMICS

    CENGAGE CHEMISTRY|Exercise Exercises (Linked Comprehension)|74 Videos

  • THERMODYNAMICS

    CENGAGE CHEMISTRY|Exercise Ex 6.4|16 Videos

  • STOICHIOMETRY

    CENGAGE CHEMISTRY|Exercise Archives Subjective|33 Videos

Similar Questions

Explore conceptually related problems

Calculate the temperature above which the reaction of lead oxide to lead in the following reaction become spontaneous. PbO(s) + C(s) rarr Pb(s) + CO(g) Given Delta H = 108.4 kJ mol^(-1), Delta S = 190 JK^(-1) mol^(-1)

Calculate the temperature above which the reduction of lead oxide to lead in the following reaction become spontaneous. PbO(s) + C(s) rightarrow Pb(s) + CO(g) Given Delta H = 118.4 kJ mol^(-1), Delta S = 200 JK^(-1) mol^(-1) .

For the reduction of lead oxide by coke (PbO+C rarr Pb+CO), Delta H and Delta S are found to be 108.8 kJ mol^(-1) and 190 JK^(-1) mol^(-1) respectively. The minimum temperature above which the reaction will be spontaneous will be

The temperature in K at which DeltaG=0 for a given reaction with DeltaH=-20.5 kJ mol^(-1) and DeltaS=-50.0 JK^(-1) mol^(-1) is

Assume DeltaH^(@) and DeltaS^(@) to be independent of temperature, at what temperature with the reaction given below becomes spontaneous? N_(2)(g) + O_(2)(g) to 2NO(g) DeltaH^(@) = 180.8 kJ mol^(-1)

Predict whether it is possible or not to reduce magnesium oxide using carbon at 298K according to the reaction. MgO(s) +C(s) rarr Mg(s) +CO(g) Delta_(r)H^(Theta) = +491.18 kJ mol^(-1) and Delta_(r)S^(Theta) = 197.67 J K^(-1) mol^(-1) If not at what temperature, the reaction becomes spontaneous.

For a reaction, Ag_(2)O(s)hArr2Ag(s)+(1)/(2)O_(2)(g) DeltaH,DeltaS and T are 40.63 kJ mol^(-1) , 108.8 J K^(-1)mol^(-1) and 373.3K respectively. Predict the feasibility of the reaction:

CENGAGE CHEMISTRY-THERMODYNAMICS-Ex 6.5
  1. Calculated the Gibbs energy change on dissolving one mole of sodium ch...

    Text Solution

    |

  2. The values of DeltaH and DeltaS for two reactions are given below: R...

    Text Solution

    |

  3. At what temperature does the reduction of lead oxide to lead by carbon...

    Text Solution

    |

  4. For the reaction, N(2)(g) +3H(2)(g) rarr 2NH(3)(g) DeltaH =- 95.0 ...

    Text Solution

    |

  5. Enthalpy and entropy changes of reaction are 40.63 kJ mol^(-1) and 108...

    Text Solution

    |

  6. Predict whether it is possible or not to reduce magnesium oxide using ...

    Text Solution

    |

  7. The standard Gibbs energy change value (Deltat(r)G^(Theta)) at 1773K a...

    Text Solution

    |

  8. In a fuel cell, methanol if used as fuel and oxygen gas is used as an ...

    Text Solution

    |

  9. On the basic of the following Delta(r)G^(Theta) values at 1073K: S(1...

    Text Solution

    |

  10. Consider the reaction: 4NH(3)(g) +5O(2)(g) rarr 4NO(g) +6H(2)O(l) De...

    Text Solution

    |

  11. Calculate the standard Gibbs free energy change from the free energies...

    Text Solution

    |

  12. Consider the reaction: 2NO(g)+O(2)(g) rarr 2NO(2)(g) Calculated th...

    Text Solution

    |

  13. For the water gas reaction: C(s) +H(2)O(g) hArr CO(g) +H(2)(g) the...

    Text Solution

    |

  14. Using the following data, calculate the value of equilibrium constant ...

    Text Solution

    |

  15. The equilibrium constant at 25^(@)C for the process: CO^(3+) (aq) +6...

    Text Solution

    |

  16. The standard Gibbd energies (Delta(f)S^(Theta)) for the formation of S...

    Text Solution

    |

  17. It is planned to carry out the reaction: CaCO(3)(g) hArr CaO(s) +CO(...

    Text Solution

    |

  18. The equilibrium constant for the reaction CO(2)(g) +H(2)(g) hArr CO(...

    Text Solution

    |

  19. Calculated the equilibrium constant for the following reaction at 298K...

    Text Solution

    |

  20. The equilibrium constant for the reaction: CH(3)COOH(l) +C(2)H(5)OH(...

    Text Solution

    |