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Why are we usually concerned with change...

Why are we usually concerned with changes in enthalpy than changes in internal energy?

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Give the appropriate reason for the followings: a. It is a preferable to determine a change in enthalpy than change in internal energy. b. It is necessary to define the 'standard state. c. It is necessary to specify the phases of the reactant and products in a thermochemical equation.

Identify the equation in which change in enthalpy is equal to change in internal energy

For which of the following reaction, change of enthalpy equals the change in internal energy ?

Consider the reaction: N_(2) + 3H_(2) hArr 2NH_(3) carried out at constant pressure and temperature. If DeltaH and DeltaU are change in enthalpy and change in internal energy respectively, then:

Consider the reaction, N_(2)+3H_(2)hArr 2NH_(3) carried out at constant pressure and temperature. If DeltaH and DeltaU are change in enthalpy and change in internal energy respectively, then :

Which of the following has no change in the internal energy?

For which of the following change DeltaH ne DeltaE ? (Where DeltaH is change in enthaply , DeltaE is change in internal energy ).

MODERN PUBLICATION-THERMODYNAMICS-Revision Exercise (Very short answer questions)
  1. Ammonia is prepared as 3H(2)(g) + N(2)(g) to 2NH(3)(g) What should...

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  2. State first law of thermodynamics.Write it mathematical expression.

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  3. Why are we usually concerned with changes in enthalpy than changes in ...

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  4. Name the two criteria which must be met for a process to be spontaneou...

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  5. Give an example of a chemical reaction for which DeltaH^(@) gt DeltaU^...

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  6. Why do we feel cold on touching a block of ice?

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  7. Delta(f)H^(@) of Fe(2)O(3) is -825 kJ. What is the enthalpy change for...

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  8. The standard enthalpies of formation of three substances A, B and C ar...

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  9. Define molar heat capacity and specific heat capacity.

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  10. What are the units of entropy and free energy?

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  11. Explain the state of a reaction when DeltaG =0.

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  12. Write Gibbs Helmholtz equation giving meanings of the symbols used.

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  13. What is the sign of DeltaS for (i) evaporation of liquid water ? (...

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  14. When an ideal gas expands in vaccum, there is neither absorption nor e...

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  15. In a process, a system does 145 J of work on its surroundings while 85...

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  16. How is free energy change related to equilibrium constant for the reac...

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  17. Predict DeltaS for the reaction : NH(3)(g) + HCI (g) to NH(4)CI(s).

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  18. Why does the entropy of a solid increase on melting?

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  19. What is the effect of temperature on entropy?

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  20. State the second law of thermodynamics.

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