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

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_2)(g, 1bar)`

A

0.40 V

B

0.81 V

C

1.23 V

D

`-0.40V`

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

  • ELECTROCHEMISRY

    RESONANCE|Exercise CBSE Problems|34 Videos

  • ELECTRO CHEMISTRY

    RESONANCE|Exercise PHYSICAL CHEMITRY (ELECTROCHEMISTRY)|53 Videos

  • EQUIVALENT CONCEPT & TITRATIONS

    RESONANCE|Exercise Part -IV|22 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 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.

The standard reduction potential of the reaction H_(2)O+e^(-) rarr 1/2 H_(2) +OH , at 298 K, is

At 25^(@)C the heat of formation of H_(2)O_((l)) is -285.9" kJ mole"^(-1) and that for H_(2)O_((g)) is -242.8" kJ mole"^(-1) . The heat of vaporization of water at the same temperature is

The enthalpy of solution , sodium and sodium oxide in large volume of water , are -18KJ/mole and -238KJ/mol, respectively . If the enthalpy of formation of water is -286 KJ/mol, then what is the enthalpy of formation of sodium oxide ? All the enthalpies are at 298K and 1 bar pressure. [Given : reaction involved are 2Na(s)+2H_(2)O(l)to 2NaOH(aq)+H_(2)(g) Na_(2)O(s)+H_(2)O(l)to2NaOH(aq)

Standard free energies of formation (I kJ // mol ) at 298 K are -237 .2 , - 394 .4 and - 8.2 for H_2 O(1), CO_2 (g) and pentange (g) , respectively . The value of E_(cell)^@ for the pentane-oxygen fuel cell is .

RESONANCE-ELECTROCHEMISRY-Advanced Level Problems
  1. Zn amalgam is prepared by electrolysis of aqueous ZnCl(2) using Hg cat...

    Text Solution

    |

  2. A solution containing one mole per litre each of Cu(NO(3))(2),AgNO(3),...

    Text Solution

    |

  3. At 298 K the standard free energy of formation of H(2)O(l) is -237.20 ...

    Text Solution

    |

  4. Wlhich of the following cell can produce more electrical work?

    Text Solution

    |

  5. A hydrogen electrode is immersed in a solution with pH = 0 (HCl). By h...

    Text Solution

    |

  6. A current of 1.0 A was passed for 2 hr through a solution of cuprocyan...

    Text Solution

    |

  7. A resistance of 50Omega is registered when two electrodes are suspende...

    Text Solution

    |

  8. Calcualte the cell EMP in mV for Pt|H(2)(1 atm) | HCl(0.01 M)|| AgCl...

    Text Solution

    |

  9. Calculate the value of Lambda(m) ^prop for SrCl(2) in water at 25^(@)...

    Text Solution

    |

  10. A current is passed through 2 voltmeters connected in series. The firs...

    Text Solution

    |

  11. Which of the following is not true about emf of a cell?

    Text Solution

    |

  12. The number of electrons delivered at the cathode during electrolysis b...

    Text Solution

    |

  13. By the electrolysis of aqueous solution of CuSO(4), the products obtai...

    Text Solution

    |

  14. How many gm of silver will be displaced from a solution of AgNO(3) by ...

    Text Solution

    |

  15. The "mole"s of electrons required to deposit 1 gm equivalent aluminium...

    Text Solution

    |

  16. How many electrons flow when a current of 5 amperes is passed through ...

    Text Solution

    |

  17. A current of 9.95 amp following for 10 minutes, deposits 3 gm of a met...

    Text Solution

    |

  18. Which of the following has been universally accepted as a reference el...

    Text Solution

    |

  19. A certain current liberated 0.504 g of hydrogen in 2 hours. How many g...

    Text Solution

    |

  20. The specific conductance of a N/10 KCl at 25^(@)C is 0.0112 ohm^(-1) c...

    Text Solution

    |