Related InterviewSolutions

• Calculate the workdone, and change in internal enegry taking place when an ideal gas undergos isothermal expansion.
• Internal enegry of a system of molecules is determined by taking into consideration itsA. Kinetic enegryB. Vibrational enegryC. Rotantional energyD. All kinds of energies present in the molecules
• The enthalpies of neutralisation of a string acid `HA` and a weaker acid `HB` by `NaOH` are `-13.7` and `-12.7 kcal Eq^(-1)`, respectively. When one equivalent of `NaOH` is added to a mixture containing one equivalent of `HA` and `HB`, the enthalpy change was `-13.5kcal`. In what ratio is the base distributed between `HA` and `HB`?
• For the percipitation reaction of `Ag^(o+)` ions with `NaCI`, which of the following statements is true?A. `DeltaH` is zero for the reaction.B. `DeltaG` is zero for the reaction.C. `DeltaG` is negative for the reaction.D. `DeltaG` should be equal to `DeltaH`.
• The lattice energy of solid `NaCI` is `180 kcal mol^(-1)`. The dissolution of the solid in `H_(2)O` is endothermic to the extent of `1.0 kcal mol^(-1)`. If the hydration energies of `Na^(o+)` and `CI^(Theta)` ions are in the ratio of `6:5` what is the enthalpy of hydration of sodium ion?A. `-85 kcal mol^(-1)`B. `-98 kcal mol^(-1)`C. `+82 kcal mol^(-1)`D. `+100 kcal mol^(-1)`
• For the reaction,` 2Co +O_(2)rarr 2CO_(2), DeltaH = - 560 kJ `. Two moles of CO and one mole of`O_(2)` are taken in a container of volume 1 L. They completely reacts to form two moles of `CO_(2)`. The gases deviate appreciably from ideal behaviour. Ifthe pressure in the vessel changesfrom 70 to 40 atm,find the magnitude ( absolute value) of `DeltaU` at 500 K `( 1 L atm = 0.1 kJ )`.
• The enthalpy of neutralization of oxalic acid by a strong base is `- 25.4 kcal mol^(-1)`. The enthalpy of neutralization of strong acid and strong base is `-13.7 kcal equiv^(-1)` . The enthalpy of dissociation of `H_(2)C_(2)O_(4) hArr 2H^(+) C_(2)O_(4)^(2-)` isA. `1.0 kcal mol^(-1)`B. `2.0 kcal mol^(-1)`C. ` 18.55 kcal mol^(-1)`D. `11.7 kcal mol^(-1)`
• The lattice energy of NaCl is 180 kcal `//` mol . The dissociation of the solid in water in the form of ioins is endothermicto the extent of 1 kcal` //` mol.If the solvation energies of`Na^(+)` and `Cl^(-)` ions are in theratesof`6:5` , calculate the enthalpy of hydration of `Na^(+)` ions.
• Determine the value of `DeltaH` and `DeltaU` for the reversible isothermal evaporation of `90.0g` of water at `100^(@)C`. Assume that water behaves as an ideal gas and heat of evaporation of water is `540 cal g^(-1) (R = 2.0 cal mol^(-1)K^(-1))`.
• What is the criteriafor spontaneity in terms of free energy change ?