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The standard heat of formation of diamo...

The standard heat of formation of diamond, although an elementary substance, is not taken as zero. Explain why ?

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The standard heat of formation of sodium ions in aqueous solution from the following data: Heat of formation of NaOH(aq) from NaOH(s) at 25^@C=-470 kJ Heat of formation of OH-(aq) from OH-(s) at 25^@C=-228.8 kJ .

Explain why the enthalpy of formation and the entropy of formation of an element in its standard state at 298 K and 1 bar pressure are not equal ?

Why is entropy of substance taken as zero at absolute zero temperature ?

The standard heat of formation of NO_2(g) amd N_2O_4(g) are 8.0 2.0 kcal mol^-1 respectively. The heat of dimerization of NO_2 in kcal is:

Calculate the heat of formation of benzene given that the standard heat of combustion of benzene is - 3266 kJ and standard heat of formation of CO_(2)(g) and H_(2)O(l) are - 393.1 kJ and - 286 kJ respectively.

Although– NH_2 group is o-and p-directing aniline on nitration gives a substantial amount of m-nitroaniline. Explain why ?

Explain why entropies of all pure substances at aboslute zero are zero.

Standard heat of formation of CH_4(g), CO_2(g) and water at 25^@C are -17.9, -94.1 K and -68.3 kcal mol^-1 respectively. Calculate the heat change (in kcal) in the following reaction at 25^@C: CH_4(g)+2O_2(g)=CO_2(g)+2H_2O(g)

Diamond and solid rhombic sulphur both are covalent solids but the latter has very low melting point than the former. Explain, why?

MBD PUBLICATION-THERMODYNAMICS-Question Bank
  1. What are the required thermodyanmic criteria for a reaction to be spon...

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  2. Under what condition, enthalpy change is equal to heat of reaction ?

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  3. The standard heat of formation of diamond, although an elementary sub...

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  4. Are the bond energies of all the four C-H bonds in methane molecule eq...

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  5. Why is entropy of substance taken as zero at absolute zero temperature...

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  6. What is the value of change in entropy at equilibrium ?

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  7. Neither q nor w is a state function but (q+w) is a state function. Exp...

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  8. Arrange water vapour, liquid water and ice in the order of increasing ...

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  9. Why does a real crystal has more entropy than an ideal crystal ?

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  10. How does entropy change with increase in temperature,

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  11. How does entropy change with decrease in pressure ?

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  12. Do you expect triangleS to be +ve, -ve or zero for reaction : H2(g)+...

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  13. Is the entropy of the universe constant ?

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  14. What is mean by macroscopic properties in thermodynamics ?

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  15. Define intensive properties and give few examples.

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  16. How can you convert an extensive property to an intensive property ?

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  17. Give relation betwween internal energy change and enthalpy change.

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  18. What are the standard states for various form of matter ?

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  19. Define and illustrate standard enthalpy of reaction.

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  20. Define and illustrate standard enthalpy of formation.

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