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Define and explain the enthalpy of atomi...

Define and explain the enthalpy of atomisation`(Delta_(a)H^(theta)).`

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It is the enthalpy change on breaking one mole of bonds completely to obtain neutral atoms in the gas phase.
In case of diatomic molecules, like `H_(2),HCI ` etc., the enthalpy of atomisation is also the bond dissociation enthalpy. In the case of metals enthalpy of atomisation is the enthalpy of sublimation.
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VGS PUBLICATION-BRILLIANT-THERMODYNAMICS-SHORT ANSWER QUESTIONS
  1. State and explain the Hess's law of constant heat summation.

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  2. Define and explain the enthalpy of combustion (Delta(c)H^(theta)).

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  3. Define and explain the enthalpy of atomisation(Delta(a)H^(theta)).

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  4. Define and explain the bond enthalpy (Delta("bond")H^(theta)).

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  5. What is the bond enthalpy of C-H bond of CH(4)?

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  6. Define heat of solution (Delta("sol")H^(theta)) and heat of dilution.

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  7. Define ionisation enthalpy and electron affinity.

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  8. Explain the spontaneity of a process.

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  9. Is decrease in enthalpy a criterion for spontaneity? Explain.

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  10. What is entropy? Explain with examples.

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  11. Is increases in entropy a criterion for spontaneity? Explain.

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  12. Can DeltaU and DeltaS discriminate between irreversible and reversible...

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  13. In which of the following process entropy increases? a) A liquid ev...

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  14. For the oxidation of iron 4Fc((s))+3O(2(g))to2Fe((2))O(3(s)), the ...

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  15. Which formulate in the following are correct? a) G=H-TS b) DeltaG(...

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  16. Calculate Delta(r)G^(theta) for conversion of oxygen to ozone (3)/(2)O...

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  17. State the second law of thermodynamics and explain it.

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  18. State the third law of thermodynamics.

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  19. What is entropy? Explain with examples.

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  20. Explain spontaneity of a process in terms of Gibbs energy.

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