Thermodynamics questions
1906 published questions with worked solutions.
- When ΔH_vap = 30 kJ/mol and ΔS_vap = 75 J mol⁻¹ K⁻¹, then the temperature of vapour, at one atmosphere is ______ K.
- The volume of an ideal gas (γ = 1.5) is changed adiabatically from 5 litres to 4 litres. The ratio of initial pressure to final...
- The heat of solution of anhydrous CuSO₄ and CuSO₄·5H₂O are −70 kJ mol⁻¹ and +12 kJ mol⁻¹ respectively. The heat of hydration of...
- When equal volume of 1M HCl and 1M H₂SO₄ are separately neutralised by excess volume of 1M NaOH solution, x and y kJ of heat is...
- During an adiabatic process, the pressure of a gas is found to be proportional to the cube of its absolute temperature. The ratio...
- If three moles of an ideal gas at 300 K expand isothermally from 30 dm³ to 45 dm³ against a constant opposing pressure of 80 kPa,...
- Standard enthalpy of vapourisation for CCl₄ is 30.5 kJ mol⁻¹. Heat required for vapourisation of 284 g of CCl₄ at constant...
- Two reaction are given below : 2Fe(s) + (3/2)O₂(g) → Fe₂O₃(s), ΔH° = –822 kJ/mol; C(s) + ½O₂(g) → CO(g), ΔH° = –110 kJ/mol. Then...
- If 5 moles of an ideal gas expands from 10 L to a volume of 100 L at 300 K under isothermal and reversible condition then work,...
- Consider the following reaction at 298 K. (3/2)O₂(g) ⇌ O₃(g), K_p = 2.47 × 10⁻²⁹. Δ_rG° for the reaction is ________ kJ. (Given R...
- For the reaction 2NO_2(g) N_2O_4(g), when S = –176.0 JK^ -1 and H = –57.8 kJ mol^ -1 , the magnitude of G at 298 K for the...
- For an ideal heat engine, the temperature of the source is 127°C. In order to have 60% efficiency the temperature of the sink...
- At 25°C, 50 g of iron reacts with HCl to form FeCl_2 . The evolved hydrogen gas expands against a constant pressure of 1 bar. The...
- In thermodynamics, heat and work are :
- During which of the following processes, does entropy decrease ? (A) Freezing of water to ice at 0°C (B) Freezing of water to ice...
- A carnot's engine working between 400 K and 800 K has a work output of 1200 J per cycle. The amount of heat energy supplied to...
- The standard enthalpies of formation of Al_2O_3 and CaO are – 1675 kJ mol ^ -1 and – 635 kJ mol ^ -1 respectively. For the...
- For an adiabatic expansion of an ideal gas, the fractional change in its pressure is equal to (where is the ratio of specific...
- For the reaction C_2H_6 C_2H_4+H_2 the reaction enthalpy rH = ———— kJ mol^ -1 [Given : Bond enthalpies in kJ mol^ -1 : C–C : 347,...
- For the reaction 2Fe^ 3+ (aq)+2I^-(aq) 2Fe^ 2+ (aq)+I_2(s) the magnitude of standard molar free energy change, _rG_m^0 = ———— kJ...
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