Home
Class 11
CHEMISTRY
The following reaction is performed at 2...

The following reaction is performed at 298 K.
`2NO_((g)) + O_(2(g)) hArr 2NO_(2(g))`
The standard free energy of formation of `NO_((g))` is 86.6 kJ/mol at 298 K. What is the standard free energy of formation of `NO_(2(g))` at 298 K ?
`(K_(p) = 1.6 xx 10^(12) )`

A

`R (298) "In" (1.6 xx 10^(12) ) - 86600`

B

`86600 + R (298) "In" (1.6 xx 10^(12) )`

C

`86600 - ("In" (1.6 xx 10^(12) ))/( R(298))`

D

`0.5 [2xx 86600- R (298) "In" (1.6 xx 10^(12) )`

Text Solution

Verified by Experts

The correct Answer is:
D
`2NO_((g)) + O_(2(g)) hArr 2NO_(2(g))`
`(Delta G^(@) )_("reaction") = [(Delta G^(@) )_("formation") ]_("product")-[(DeltaG^(@))_("formation")]_("reactant")`
`rArr - RT "In" K_(p) = 2 xx (Delta G^(@) )NO_(2) - 2(Delta G^(@) ) NO`
`rArr (Delta G^(@) ) NO_(2) = 2(Delta G^(@) )_(NO)`
`= -RT " In " K_(p)`
`rArr (Delta G^(@) )_(NO_2) = (2 xx 86600- R (298)"In" K_(p) )/(2) `
`= (2xx 86600 - R (298) "In" 1.6 xx 10^(12) )/( 2)`
`=0.5 [2 xx 86,600 - R (298) "In" (1.6 xx 10^(12) )]`
Promotional Banner

Topper's Solved these Questions

  • THERMODYNAMICS

    KUMAR PRAKASHAN|Exercise Section - C Multiple Choice Questions (MCQs) (MCQs asked in Board Exam)|26 Videos

  • THERMODYNAMICS

    KUMAR PRAKASHAN|Exercise Section - D Solutions of NCERT Exemplar Problems (Multiple Choice Questions (MCQs) )|14 Videos

  • THERMODYNAMICS

    KUMAR PRAKASHAN|Exercise Section - C Multiple Choice Questions (MCQs) (MCQs asked in Competitive Exam)|45 Videos

  • THE s-BLOCK ELEMENTS

    KUMAR PRAKASHAN|Exercise Section-D NCERT Exemplar Solution (Long Answer Type)|8 Videos

Similar Questions

Explore conceptually related problems

For the equilibrium N_(2)O_(4(g))hArr 2NO_(2(g)) , the K_(p) and K_(c ) values are related as

Predict whether the reaction CO_((g)) + H_2O_((g)) to CO_(2(g)) + H_(2(g)) is spontaneous or not. The standard free energies of formation of CO_((g)), H_2O_((g)) and CO_(2(g)) are – 137.27, –228.6 and –394.38 kJ mole"^(-1) respectivley.

Calculate the standard free energy change of the reaction : 4NH_(3(g)) + 5O_2 to 4NO_((g)) + 6H_2O_((l)) and predict on the feasibility of the reaction. Standard free energies of formation of NH_(3(g)),NO_((g)) and H_2O_((l)) are 16.65, 86.61, –237.20 kJ. "mole"^(-1) respectively.

KUMAR PRAKASHAN-THERMODYNAMICS-Section - C Multiple Choice Questions (MCQs) (MCQs asked in JEE/ NEET / AIEE)
  1. Given that bond energies of H - H and Cl -Cl are 430 "kJ/mol"^(-1) and...

    Text Solution

    |

  2. Which of the following is not a state functions?

    Text Solution

    |

  3. For the gas phase reaction, PCI(5(g)) hArr PCI(3(g)) + CI(2(g)) Wh...

    Text Solution

    |

  4. Bond dissociation enthalpy of H(2), CI(2) and HCI are 434, 242 and 431...

    Text Solution

    |

  5. The values of Delta H and Delta S for the reaction, C("(graphite)") + ...

    Text Solution

    |

  6. Standard entropies of x(2) , y(2) and xy(3) are 60,40 and 50 "J/K mol"...

    Text Solution

    |

  7. For vapourisation of water at 1 atm,values of DeltaH &DeltaSare 40.6 K...

    Text Solution

    |

  8. The following two reactions are known : <be> Fe(2) O(3(s)) + 3CO((g)) ...

    Text Solution

    |

  9. If the enthalpy change for the transition of liquid water to steam is ...

    Text Solution

    |

  10. For complete combustion of ethanol, C(2) H(5) OH((l)) + 3O(2(g)) to 2C...

    Text Solution

    |

  11. The following reaction is performed at 298 K. 2NO((g)) + O(2(g)) hAr...

    Text Solution

    |

  12. The standard Gibbs energy change at 300 K for the reaction 2A hArr B+ ...

    Text Solution

    |

  13. Which of the following statements is correct for a reversible process ...

    Text Solution

    |

  14. Which of the following species contains equal number of sigma - and pi...

    Text Solution

    |

  15. The heat of combustion of carbon to CO(2) is -393.5 "kJ/mol". The heat...

    Text Solution

    |

  16. For the spontaneous reaction at each temperature .......... .

    Text Solution

    |

  17. For a sample of perfect gas when its pressure is changed isothermally ...

    Text Solution

    |

  18. If the E("cell")^(@) for a given reaction has a negative value, which ...

    Text Solution

    |

  19. If Delta H = 35.5 kJ/mol and Delta S = 83.6 J/mol K. At what temperatu...

    Text Solution

    |