If the enthalpy change for the transition of liquid water to steam
If the enthalpy change for the transition of liquid water to steam is 30 kJ mol⁻¹ at 27⁰C, the entropy change for the process would be
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(a) 10 J mol⁻¹ K⁻¹ (b) 1.0 […]
Questions
For vaporization of water at 1 atmospheric pressure, the values of ΔH and ΔS
For vaporization of water at 1 atmospheric pressure, the values of ΔH and ΔS are 40.63 kJ mol⁻¹ and 108.8 JK⁻¹ mol⁻¹ ,respectively. The temperature when Gibb’s energy change ( ΔG) for this transformation will […]
Standard entropies of X₂, Y₂ and XY₃ are 60, 40 and 50 J K⁻¹ mol⁻¹ respectively.
Standard entropies of X₂, Y₂ and XY₃ are 60, 40 and 50 J K⁻¹ mol⁻¹ respectively. For the reaction 1/2X₂ + 3/2Y₂ ⇌ XY₃,ΔH = -30 kJ, to be at equilibrium ,the temperature should be […]
For an endothermic reaction, energy of activation is Ea and enthalpy of reaction
For an endothermic reaction, energy of activation is Ea and enthalpy of reaction is ΔH (both of these in kJ/mol). Minimum value of Ea will be
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(a) less than ΔH (b) equal to […]
The absolute enthalpy of neutralisation of the reaction
The absolute enthalpy of neutralisation of the reaction MgO(s) + 2HCl(aq) → MgCl₂(aq) + H₂O(l) will be
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(a) -57.33 kJ mol⁻¹ (b) greater then -57.33 kJ mol⁻¹ (c) less then -57.33 kJ mol⁻¹ […]
A reaction occurs spontaneously is
A reaction occurs spontaneously is
Options
(a) TΔS < ΔH and both ΔH and ΔS are +ve (b) TΔS > ΔH and ΔH is +ve and ΔS is -ve (c) TΔS > ΔH and […]
Which of the following pairs of a chemical reaction is certain to result
Which of the following pairs of a chemical reaction is certain to result in a spontaneous reaction
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(a) exothermic and increasing disorder (b) exothermic and decreasing disorder (c) endothermic and increasing disorder (d) […]
Considering entropy (S) as a thermodynamic parameter, the criterion
Considering entropy (S) as a thermodynamic parameter, the criterion for the spontaneity of any process is
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(a) ΔS system + ΔS surroundings > 0 (b) ΔS system – ΔS surroundings > 0 (c) […]
Standard enthalpy and standard entropy changes for the oxidation of ammonia
Standard enthalpy and standard entropy changes for the oxidation of ammonia at 298 K are -382.64 kJ mol⁻¹ and -145.6 kJ mol⁻¹, respectively. Standard Gibbs energy change for the same reaction at 298 k is […]
The work done during the expansion of a gas from a volume of 4 dm³ to 6 dm³
The work done during the expansion of a gas from a volume of 4 dm³ to 6 dm³ against a constant external pressure of 3 atm is (1atm = 101.32 J)
Options
(a) -6 […]