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Define standard enthalpy of formation ....

Define standard enthalpy of formation .

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Standard enthalpy of formation of a compound is the change in enthalpy when one mole of the compound is formed form its elements in their standard states under standard conditions i.e, at 298 K and 101.3 Kpa pressure.
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Explain standard enthalpy of formation (Delta_(f)H^(@)) .

Calculate the standard enthalpy of formation of liquid benzene (C_(6)H_(6)) . Given the enthalpies of combustion of Carbons (s), Hydrogen (g) and Benzene (I) are -393.5kJ, -285.83kJ and -3267.0 respecitvely.

The standard enthalpy of formation of NH_(3) is - 46.0 kJ mol^(-1) . If the enthalpy of formation of H_(2) from its atoms is - 436 kJ mol^(-1) and that of N_(2) is - 712 kJ mol^(-1) , the average bond enthalpy of N - H bond is NH_(3) is

Calculate the standard enthaly of formation of Methane. Given that the standard enthalpy of combustion of Methane, carbon and Hydrogen are -893.3kJ, -3.93kJ and -285.8kJ respectively.

Calculate standard free energy of formation of H_2O_((l)) . The standard enthalpy of formation of H_2O_((l)) is 285.85 kJ and standard entropies of H_(2(g)), O_(2(g)) and H_2O_((l)) are130.5, 205.0 and 70.3 J. K^(-1) "mole"^(-1) respectively.

The enthalpy of combustion of one mole of benzene,carbon and hydrogen are-3267 kj mol-1 ,-393.5 kj mol^-1 and -285.8 kj mol^-1 respectively.Calculate the stnadard enthalpy of formation of benzene.

SUBHASH PUBLICATION-CHEMICAL THERMODYNAMICS-Numerical problems :
  1. Define standard enthalpy of formation .

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  2. Calculate the hest of reaction of the following reaction : C(6)H(12)...

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  3. Calculate the heat of reaction of the following reaction : CO(2)(g) ...

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  4. 1m^(3) of C(2) H(4) at STP is burnt in oxygen, according to the thermo...

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  5. With the help of a thermochemical equation, calculate Delta(f)H^(@) at...

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  6. The heat of combustion of C(2)H(6) is -368.4 kcal. Calculate the heat ...

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  7. The following thermochemical equations represent combustion of ammonia...

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  8. The equilibrium constant at 25^(@)C for the process CO^(3+)(aq) + 6N...

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  9. What is the value of the equilibrium constant for the following reacti...

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  10. 1.250 g of a sample of octane (C(8)H(18)) is burnt in excess of oxygen...

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  11. Calculate the standard free energy change Delta G^(@) for the reaction...

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  12. From the data given below at 298 K for the reaction : CH(4)(g) + 2O(...

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  13. Calculate the free energy change when 1 mole of NaCl is dissolved in w...

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  14. For the equilibirum, PCl(5)(g) hArr PCl(3)(g) + Cl(2)(g) at 298 K, K =...

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  15. Calculate the entropy change involved in convertion of 1 mole of water...

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  16. Calculate Delta H(f) of HCl if bond energy of H-H bond is 437 kJ Cl-CL...

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  17. Calculate the Gibb's energy change for the formation of propane, C(3)H...

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  18. For the reaction, N(2)(g) + 3H(2)(g) rarr 2NH(3)(g), Delta H = -95.2 k...

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  19. For a water gas reaction, C((s)) + H(2)O((g)) hArr CO((g)) + H(2(g)) a...

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  20. Calculate the standard free energy for a reaction X hArr Y, if the val...

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  21. Calculate the standard Gibb's energy change for a reaction at 298 K, i...

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