Home
Class 11
CHEMISTRY
Consider the DeltaG(f)^(@) and DeltaH(f)...

Consider the `DeltaG_(f)^(@)` and `DeltaH_(f)^(@)` (kJ`//`mol) for the following oxides. Which can be most easily decomposed to form the metal and oxygen gas?

A

`ZnO(DeltaG^(@)=-318.4, DeltaH^(@)=-348.3)`

B

`Cu_(2)O(DeltaG^(@)=-146.0, DeltaH^(@)=-168.8)`

C

`HgO(DeltaG^(@)=-58.5, DeltaH^(@)=-90.8)`

D

`PbO(DeltaG^(@)=-187.9, DeltaH^(@)=-217.3)`

Text Solution

Verified by Experts

The correct Answer is:
C
`DeltaG^(@)=-RTlnK, " K"uarr"stability of reactant"darr`
Promotional Banner

Topper's Solved these Questions

  • THERMODYNAMICS

    NARENDRA AWASTHI|Exercise Level 3 - One Or More Answers Are Correct|1 Videos

  • THERMODYNAMICS

    NARENDRA AWASTHI|Exercise Level 3 - Match The Column|2 Videos

  • THERMODYNAMICS

    NARENDRA AWASTHI|Exercise Level 2 (Q.1 To Q.30)|1 Videos

  • STOICHIOMETRY

    NARENDRA AWASTHI|Exercise Level 3 - Subjective Problems|20 Videos

Similar Questions

Explore conceptually related problems

Standard Gibb's energy of reaction (Delta_(r )G^(@)) at a certain temperature can be computed Delta_(r )G^(@)=Delta_(r)H^(@)-T.Delta_(r )S^(@) and the change in the value of Delta_(r)H^(@) and Delta_(r)S^(@) for a reaction with temperature can be computed as follows : Delta_(r )H_(T_(2))^(@)-Delta_(r )H_(T_(1))^(@)=Delta_(r )C_(p)^(@)(T_(2)-T_(1)) Delta_(r )S_(T_(2))^(@)-Delta_(r )S_(T_(1))^(@)=Delta_(r )C_(p)^(@)ln.(T_(2)/T_(1)) " "Delta_(r )G^(@)=Delta_(r)H^(@)-T.Delta_(r)S^(@) and " by "Delta_(r )G^(@)=-"RT " ln K_(eq) . Consider the following reaction : CO(g)+2H_(2)(g)iffCH_(3)OH(g) Given : Delta_(f)H^(@)(CH_(3)OH,g)=-201 " kJ"//"mol", " "Delta_(f)H^(@)(CO,g)=-114" kJ"//"mol" S^(@)(CH_(3)OH,g)=240" J"//"K-mol, "S^(@)(H_(2),g)=29" JK"^(-1)" mol"^(-1) S^(@)(CO,g)=198 " J"//"mol-K, "C_(p,m)^(@)(H_(2))=28.8 " J"//"mol-K" C_(p,m)^(@)(CO)=29.4 " J"//"mol-K, "C_(p,m)^(@)(CH_(3)OH)=44 " J"//"mol-K" and " "ln ((320)/(300))=0.06 , all data at 300 K Delta_(r )G^(@) at 320 K is :

Standard Gibb's energy of reaction (Delta_(r )G^(@)) at a certain temperature can be computed Delta_(r )G^(@)=Delta_(r)H^(@)-T.Delta_(r )S^(@) and the change in the value of Delta_(r)H^(@) and Delta_(r)S^(@) for a reaction with temperature can be computed as follows : Delta_(r )H_(T_(2))^(@)-Delta_(r )H_(T_(1))^(@)=Delta_(r )C_(p)^(@)(T_(2)-T_(1)) Delta_(r )S_(T_(2))^(@)-Delta_(r )S_(T_(1))^(@)=Delta_(r )C_(p)^(@)ln.(T_(2)/T_(1)) " "Delta_(r )G^(@)=Delta_(r)H^(@)-T.Delta_(r)S^(@) and " by "Delta_(r )G^(@)=-"RT " ln K_(eq) . Consider the following reaction : CO(g)+2H_(2)(g)iffCH_(3)OH(g) Given : Delta_(f)H^(@)(CH_(3)OH,g)=-201 " kJ"//"mol", " "Delta_(f)H^(@)(CO,g)=-114" kJ"//"mol" S^(@)(CH_(3)OH,g)=240" J"//"K-mol, "S^(@)(H_(2),g)=29" JK"^(-1)" mol"^(-1) S^(@)(CO,g)=198 " J"//"mol-K, "C_(p,m)^(@)(H_(2))=28.8 " J"//"mol-K" C_(p,m)^(@)(CO)=29.4 " J"//"mol-K, "C_(p,m)^(@)(CH_(3)OH)=44 " J"//"mol-K" and " "ln ((320)/(300))=0.06 , all data at 300 K Delta_(r )H^(@) at 300 K for the reaction is :

Which of the following value of DeltaH_(f)^(@) represent that the product is least stable ?

Fuel cells convert the energy produced during the combustion of fuels cells directly into electrical energy. Probably the most successful fuel cell so far is hydrogen oxygen fuel cell, which has ben used in spacecraft. The electrodes consist of porous screens of titanium coated with a layer of platinum catalyst. concentrated KOH or NaOH soloution is placed beween the electrodes to serve the as electrolyte. hydrogen and oxygen gases are bubbled through the porous electrodes into the electrolyte solution The following electrodes reactions occur: At anode: 2H_2(g)+4OH^(-)(aq)rarr4H_2O(l)+4bare At cathode: O_2(g)+2H_2O(l)+4barerarr4Oh^-(aq) Overall reaction: 2H_2(g)+O_2(g)rarr2H_2O(l) In this cell, the gaseous materials are consumed and continously supplied. The thermodynamic properties of fuel cell reaction at 25^@C are: DeltaH^@=-285.8kJ mol^-1,DeltaG^@=-237.2kJ mol^-1, E^@=1.23V If the potential of the half cell reaction is at cathode is, E^@=0.41V , then E^@ for the half cell reaction at anode is

By considering their position in the periodic table, which one of the following elements would you expect to have the most metalllic characteristics? Ga Ge As Se Be.

Consider the composite system, which is held at 300 k , shown in the following figure. Assuming ideal gas behavior, calculate the total pressure if the barriers sparating the compartments are removed. Assume that the volume of the barriers is negligible. (Given : R =0.082 atm L/mol. K)

Consider the following two complex ions: [CoF_6]^(3-) and [Co(C_2O_4)_3]^(3-) . Which of the following statement(s) is/are false? I. Both are octahedral. II. [Co(C_2O_4)_3]^(3-) is diamagnetic while [CoF_6]^(3-) is paramagnetic. III. Both are outer orbital complexes. IV. Inboth the complexes the central metal is in the same oxidation state.

NARENDRA AWASTHI-THERMODYNAMICS-Exercise
  1. Calculate DeltaH(f)^(@) for Ubr(4) from the DeltaG^(@) of reaction and...

    Text Solution

    |

  2. The entropies of H(2) (g) and H (g) are 130.6 and 114.6 J mol^(-1)K^(-...

    Text Solution

    |

  3. Consider the DeltaG(f)^(@) and DeltaH(f)^(@) (kJ//mol) for the followi...

    Text Solution

    |

  4. which of the folowing statement is correct?

    Text Solution

    |

  5. Calculate DeltaG^(@) (kJ/mol) at 127^(@)C for a reaction with K("equil...

    Text Solution

    |

  6. When reaction is at standard state at equilibrium, then

    Text Solution

    |

  7. For the auto-ionization of water at 25^(@)C, H(2)O(l)iff H^(+)(aq)+OH^...

    Text Solution

    |

  8. State Hess's law. Give two applications of it.

    Text Solution

    |

  9. An imaginary reaction X rarr Y takes place in three steps X rarr A...

    Text Solution

    |

  10. The enthalpy change for a reaction does not depend upon:

    Text Solution

    |

  11. The standard enthalpy of formation of gaseous H(2)O at 298 K is -241.8...

    Text Solution

    |

  12. Which of the following value of DeltaH(f)^(@) represent that the produ...

    Text Solution

    |

  13. For which of the following substances is the heat of formation in the ...

    Text Solution

    |

  14. Calculate the standard enthalpy of reaction for the following reaction...

    Text Solution

    |

  15. Given the following equations and DeltaH^(@) values, determine the ent...

    Text Solution

    |

  16. Given : C("diamond")+O(2)rarrCO(2),DeltaH=-395 kJ C("graphite"...

    Text Solution

    |

  17. Which of the following equations represents a reaction that provides t...

    Text Solution

    |

  18. Use the given standard enthalpies of formation (in kJ/mol) to determin...

    Text Solution

    |

  19. The standard enthalpy of formation of octane (C(8)H(18)) is -250kJ //m...

    Text Solution

    |

  20. Determine the enthalpy of formation of B(2)H(6)(g) in kJ/mol of the fo...

    Text Solution

    |