Thermodynamics-2.pptx
- 1. 1 Learn Practically Learn Practically Learn Practically THERMODYNAMICS-2
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- 3. 3 Learn Practically Learn Practically Learn Practically Learn Practically Entropy :
- 4. 4 Learn Practically Learn Practically Learn Practically Learn Practically Predict in which of the following, entropy increases/decreases : (i) A liquid crystallizes into a solid. (ii) Temperature of a crystalline solid is from 0 K to 115 K. iii) H2(g) → 2H(g)
- 5. 5 Learn Practically Learn Practically Learn Practically Learn Practically Calculate the entropy change in surroundings when 1.00 mol of H2O(l) is formed under standard conditions. ∆f H = –286 kJ mol–1.
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- 7. 7 Learn Practically Learn Practically Learn Practically Learn Practically Gibb’s Free Energy :
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- 9. 9 Learn Practically Learn Practically Learn Practically Learn Practically Given N2(g) + 3H2(g) → 2NH3(g) ; ∆rH = –92.4 kJ mol–1 What is the standard enthalpy of formation of NH3 gas?
- 10. 10 Learn Practically Learn Practically Learn Practically Learn Practically If water vapour is assumed to be a perfect gas, molar enthalpy change for vapourisation of 1 mol of water at 1bar and 100°C is 41kJ mol–1. Calculate the internal energy change, when 1 mol of water is vapourised at 1 bar pressure and 100°C.
- 11. 11 Learn Practically Learn Practically Learn Practically Learn Practically 11
- 12. 12 Learn Practically Learn Practically Learn Practically Learn Practically A swimmer coming out from a pool is covered with a film of water weighing about 18g. How much heat must be supplied to evaporate this water at 298 K ? Calculate the internal energy of vaporisation at 298K. ∆vap H for water at 298K= 44.01kJ mol–1
- 13. 13 Learn Practically Learn Practically Learn Practically Learn Practically 13
- 14. 14 Learn Practically Learn Practically Learn Practically Learn Practically The enthalpy of combustion of methane, graphite and dihydrogen at 298 K are, –890.3 kJ mol–1 –393.5 kJ mol–1, and –285.8 kJ mol–1 respectively. Enthalpy of formation of CH4(g) will be
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- 17. 17 Learn Practically Learn Practically Learn Practically Learn Practically For the reaction at 298 K, 2A + B → C ∆H = 400 kJ mol–1 and ∆S = 0.2 kJ K–1 mol–1 At what temperature will the reaction become spontaneous considering ∆H and ∆S to be constant over the temperature range.
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