Home
Class 12
CHEMISTRY
At 298K the standard free energy of form...

At 298K the standard free energy of formation of `H_(2)O(l)` is `-256.5 kJ..mol`, while that of its ionisation to `H^(+)` & `OH^(-)` is `80 kJ//mol`. What will be emf at 298 K of the cell.
`H_(2)(g,1 bar) |H^(+)(1M) || O_(2)(g,1bar)`
Fill your answer by multiplying it with 10.

Text Solution

Verified by Experts

The correct Answer is:
`005`
`H_(2) +H_(2)O +(1)/(2)O_(2) rarr 2H^(+) +2OH^(-)`
`DeltaG^(@) =- 256.5 +2 xx 80 = -96.5 kJ`
`-DeltaG^(@) = nFE^(@)`
`+96.5 xx 1000 = 2 xx 96500 xx E^(@)`
`E^(@) = 0.5` volt
Promotional Banner

Topper's Solved these Questions

  • ELECTROCHEMISTRY

    ALLEN|Exercise Part (II) EXERCISE-01|44 Videos

  • ELECTROCHEMISTRY

    ALLEN|Exercise EXERCISE-02|36 Videos

  • ELECTROCHEMISTRY

    ALLEN|Exercise COMPREHENSION TYPE|18 Videos

  • CHEMISTRY AT A GLANCE

    ALLEN|Exercise ORGANIC CHEMISTRY|483 Videos

  • HYDROCARBON

    ALLEN|Exercise MCQ|15 Videos

Similar Questions

Explore conceptually related problems

At 298 K the standard free energy of formation of H_(2)O (l) is -237.20 kJ/"mole" while DeltaG^(@) of its ionisation into H^(+) ion and hydroxyl ionosis 80kJ//"mole" , then the emf of the following cell at 298 K will be: H-92)(g,1bar)| H^(+)(1 M) || OH^(-)(1M) | O_(2)(g,1bar)

At 298 K the standard free energy of formation of H_(2)O(l) is -237.20 kJ/"mole" while that of its ionisation into H^(+) ions and hydroxyl ions is 80kJ/"mole" , then the emf of the following cell at 298 K will be : [Take 1F = 96500 C] H_(2)O(g, 1 bar)|H^(+)(1M)||OH^(-)(1M) |O_92)(g, 1bar)

The enthaply at 298K of the reaction H_(2)O_(2)(l)rarr+(1)/(2)O_(2)(g) is -23.5Kcal mol^(-1) and the enthaply of formation of H_(2)O_(2)(l) is -44.8Kcal mol^(-1) . The enthaply of formatiom of H_(2)O(l) is

If DeltaH_(f)^(@) for H_(2)O_(2)(l) and H_(2)O(l) are -188kJ and mol^(-1) and -286 kJ mol^(-1) , what will be the enthalpy change of the reaction 2H_(2)O_(2)(l)to2H_(2)O(l)+O_(2)(g) ?

The standard enthalpy of formation of H_(2)(g) and Cl_(2)(g) and HCl(g) are 218 kJ//mol , 121.88 kJ//mol and -93.31 kJ//mol respectively. Calculate standard enthalpy change in kJ for (1)/(2)H_(2)(g)+(1)/(2)Cl_(2)(g)toHCl(g)

For the fuel cell reaction 2H_(2)(g) +O_(2)(g) rarr 2H_(2)O(l), Deta_(f)H_(298)^(@) (H_(2)O,l) =- 285.5 kJ//mol What is Delta_(298)^(@) for the given fuel cell reaction? Given: O_(2)(g) +4H^(+)(aQ) +4e^(-) rarr 2H_(2)O(l) E^(@) = 1.23 V

The standard enthaply for the reaction H_(2)(g) + 1//2 O_(2)(g) to H_(2)O(l) is - 285.76 kJ at 298 K. Calculate the value of DeltaH at 373 K .The molar heat capcities at constant pressure (C_(P)) in the given temperature range of H_(2)(g),O_(2)(g) and H_(2)O(l) are respectively 38.83,16 and 75.312 JK^(-1) mol^(-1) .

ALLEN-ELECTROCHEMISTRY-INTEGER TYPE
  1. How much charge is present on 1 mole of Cu^(+2) ion in faraday. (1 Far...

    Text Solution

    |

  2. Total charge in faraday present in 54 gm of AI^(3+) ion.

    Text Solution

    |

  3. For an element 'X' the process of oxidation is: X(@)O(4)^(-2) rarr N...

    Text Solution

    |

  4. Consider a Galvenic cell, Zn(s) |Zn^(2+) (0.1M) ||Cu^(2+) (0.1M)|Cu(...

    Text Solution

    |

  5. How much charge (in F) must flow through solution during electrolysis ...

    Text Solution

    |

  6. Emf of a cell corresponding to the reaction:- Zn(s) +2H^(+) (aq) rar...

    Text Solution

    |

  7. A disposable galvanic cell Zn|Zn^(2+)||Sn^(2+)|SN is produced using 1....

    Text Solution

    |

  8. The specific conductance (k)of a 0.1M NaOH solution is 0.0221 S cm^(-1...

    Text Solution

    |

  9. For any sparingly soluble salt [M(NH(3))(4)Br(2)] H(2)PO(2) Given: l...

    Text Solution

    |

  10. An alloy of Pb-Ag weighing 54 mg was dissolved in desired amount of HN...

    Text Solution

    |

  11. A solution contains A^(+) and B^(+) in such a concentration that both ...

    Text Solution

    |

  12. An equeous solution of Na(2)SO(4) was electrolysed for 10 min. 82 ml o...

    Text Solution

    |

  13. At 298K the standard free energy of formation of H(2)O(l) is -256.5 kJ...

    Text Solution

    |

  14. Suppose the equilibrium constant for the reaction, 3M^(3+) rarr 2M^(...

    Text Solution

    |

  15. When a metal chloride MCI is dissolced in a large excess of ammonia, p...

    Text Solution

    |

  16. Molar conductance of 1M solution of weak acid HA is 20 ohm^(-1) cm^(2)...

    Text Solution

    |

  17. While the discharging of a lead storage battery following reaction tak...

    Text Solution

    |

  18. Conductivity of an aqueous solution of 0.1M HX (a weak mono-protic aci...

    Text Solution

    |