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What are the applications of Hess's Law ...

What are the applications of Hess's Law of constant heat summation?

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(i) It helps to calculate the enthalpies of formation of those compounds which cannot be determined experimentally.
(ii) It helps to determine the enthalpy of allotropic transformations like C (graphite) `rarr` C (diamond).
(iii) It helps to calculate the enthalpy of hydration.
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SUBHASH PUBLICATION-CHEMICAL THERMODYNAMICS-Two marks questions and answers :
  1. Explain standard enthalpy of atomisation (Delta(s)H^(@))

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  2. Explain with the help of an example, the difference between bond disso...

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  3. What is meant by free energy of a system ? What will be the direction ...

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  4. Why most of the exothermic process (reaction) are spontaneous ?

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  5. The enthalpy of combustion of sulphur is 297 kJ. Write the thermochemi...

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  6. What is the most important condition for a process to be reversible in...

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  7. Why the absolute value of enthalpy cannot be determined ?

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  8. What are the applications of Hess's Law of constant heat summation?

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  9. Explain standard enthalpy of dilution.

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  10. Define Molar enthalpy of fusion.

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  11. Define Molar enthalpy of vapourisation ?

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  12. Define : (a) Enthalpy of atomization (b) Lactic enthalpy.

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  13. Explain Laplace-Lavoisier law.

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  14. If the enthalpy of combustion of diamond and graphite are -395.4kJ mol...

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  15. H(2)(g) + (1)/(2)O(2)(g) rarr H(2)O(g) Delta H = -242 kJ mol^(-1). Bon...

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  16. What is a spontaneous process ? Give an example.

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  17. Define a non-spontaneous process.

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  18. Explain standard enthalpy of ionization.

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  19. State the second law of thermodynamics.

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  20. Define Gibbs energy.

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