Home
Class 12
CHEMISTRY
At 298 K, Delta H and Delta S for a reac...

At 298 K, `Delta H and Delta S` for a reaction are `-65.49 " kJ and " -145 J. K^(-1)` respectively. Calculate `Delta G, Delta S_("univ") and Delta S_("surr")` at that temperature.

Text Solution

Verified by Experts

`Delta G= Delta H- T Delta S = [ -65.49xx10^(3)- 298xx(-145) ]J`
= `-22.28 kJ`
`Delta G = - T Delta S_("univ")`
`Delta S_("univ")= (Delta G)/(T)= (22.28xx10^(3))/(298)= 74.76 J. K^(-1)`
`Delta S_("surr") = Delta S_("univ")- Delta S_("sys")= [ 74.76-(-145)]`
`= 219.76 J. K^(-1)`
Promotional Banner

Topper's Solved these Questions

  • CHEMICAL THERMODYNAMICS

    CHHAYA PUBLICATION|Exercise Practice Set 6|15 Videos

  • CHEMICAL THERMODYNAMICS

    CHHAYA PUBLICATION|Exercise LONG TYPE QUESTIONS|37 Videos

  • CHEMICAL KINETICS

    CHHAYA PUBLICATION|Exercise EXERCISE (NUMERICAL PROBLEMS)|37 Videos

  • CHEMISTRY IN EVERYDAY LIFE

    CHHAYA PUBLICATION|Exercise PRACTICE SET 15|15 Videos

Similar Questions

Explore conceptually related problems

DeltaH and DeltaS of a certain reaction are -400 kJ*mol^(-1) and -20kJ*mol^(-1)*K^(-1) respectively. The temperature below which the reaction is spontaneous is-

Values of Delta H Delta S for the given reaction are -95.4 kJ and -198.3 J*K^(-1) respectively: N_(2)(g)+3H_(2)(g) to 2NH_(3)(g) State whether the reaction will be spontaneous at 500 K or not. Consider Delta H and DeltaS are independent of temperature.

At given pressure and a temperature of 300K, DeltaS_(sys) and DeltaS_("surr") for a reaction are 8.0J*K^(-1) and 4.0J*K^(-1) respectively. DeltaG for this reaction is-

At 25^(@)C , Delta H^(0) for the reaction , N_(2)(g)+(1)/(2)O_(2)(g) to N_(2)O(g) , is +82 kJ . At this temperature if the standard molar entropies for N_(2)(g),O_(2)(g) and N_(2)O(g) are 191.6, 205.2 and 219.9 J. K^(-1). " mol"^(-1) respectively, calculate Delta S_("univ")^(0) for the reaction.

Delta H- Delta U for the reaction C_3H_8(g) +SO_2 (g) = 3CO_2 (g) + 4H_2O (g) .

The values of Delta H and Delta S in vaporisation of water at 1 atm pressure are 40.63 " kJ mol"^(-1) and 108.8 J. K^(-1). " mol"^(-1) respectively. At what temperature the free energy change of the reaction will be zero ? What will be the sign of Delta G below that temperature ?

For a given reaction , Delta H = 3.5 kJ mol^(-1) and Delta S = 83.6 J * K^(-1) mol^(-1) . The reaction is spontaneous at (assume DeltaH and Delta S do not vary with temperature) -

At 298 K, the equilibrium constant of a reaction is 1.8xx10^(-7) . If Delta H^(0) of the reaction is 28.6 kJ, calculate the value of Delta S^(0) .

In the reaction, A(s)+B(g) to C(g)+D(g),DeltaH=31kJ and DeltaS=+35J*K^(-1) . State whether the reaction will be spontaneous at 100^(@)C and 1100^(@)C or not? Consider Delta H and DeltaS are independent of temperature.

When is Delta S=Delta/T

CHHAYA PUBLICATION-CHEMICAL THERMODYNAMICS-Numerical Problems
  1. Determine the standard enthalpy of formation of FeO(s) and Fe(2)(O(3)(...

    Text Solution

    |

  2. Given that (at 25^(@)C) : (1)/(2)H(2)(g)+(1)/(2)O(2)(g) to OH(g), De...

    Text Solution

    |

  3. Molar heats of combustion of C(2)H(2)(g), C (graphite) and H(2)(g) " a...

    Text Solution

    |

  4. Given that : (i) heat of formation of water = -68.3 kcal (ii) heat of ...

    Text Solution

    |

  5. The standard molar heat of formation of ethane, carbon dioxide and liq...

    Text Solution

    |

  6. An intimate mixture of ferric oxide, (Fe(2)O(3)) and aluminium, (Al) i...

    Text Solution

    |

  7. Show that the reaction, CO(g)+(1)/(2)O(2)(g)to CO(2)(g) at 300 K is sp...

    Text Solution

    |

  8. The melting point and boiling point of sulphur dioxide are -75^(@)C an...

    Text Solution

    |

  9. Find Delta S^(0) of the reaction : CH(4)(g)+CO(2)(g) to 2CO(g)+2H(2)...

    Text Solution

    |

  10. The change in enthalpy of vaporisation of 1 mol of water is 40850 " J ...

    Text Solution

    |

  11. If the change in entropy of reversible isothermal expansion of 1 mol o...

    Text Solution

    |

  12. Calculate the change in entropy for the following process : 2 mol of N...

    Text Solution

    |

  13. The values of Delta H and Delta S in vaporisation of water at 1 atm pr...

    Text Solution

    |

  14. At 300 K, the enthalpy change and entropy change of a reaction are -10...

    Text Solution

    |

  15. H(2)O(l) to H(2)(g)+(1)/(2)O(2)(g) Does the above reaction occur spont...

    Text Solution

    |

  16. At 298 K, the equilibrium constant of a reaction is 1.8xx10^(-7). If D...

    Text Solution

    |

  17. At 298 K, Delta H and Delta S for a reaction are -65.49 " kJ and " -14...

    Text Solution

    |

  18. For a reactio, Delta H= - 10000 " J. mol"^(-1) and Delta S = - 33.3 " ...

    Text Solution

    |

  19. Two moles of a perfect gas undergoes the following process : (i) a rev...

    Text Solution

    |

  20. At 25^(@)C , Delta H^(0) for the reaction , N(2)(g)+(1)/(2)O(2)(g) to ...

    Text Solution

    |