Question

When ΔG ̊=0, the system is at equilibrium and both the forward and reverse reaction are proceeding at equal rates. This is the case during phase transitions. Consider the phase transition and the data shown for BCl3 below. Calculate the boiling point (in ̊C) for BCl3. BCl3(l) ⇄ BCl3(g) Hf ̊ (kJ/mole) S ̊ (J/mol∙K) BCl3(l) -418 209 BCl3(g) -395 290

4. When AG°=0, the system is at equilibrium and both the forward and reverse reaction are proceeding at equal rates. This is the case during phase transitions. Consider the phase transition and the data shown for BC13 below. Calculate the boiling point in °C) for BC13. BC13(1) = BC13(g) Sº (kJ/mole) (J/mol·K) BC13(1) -418 / 209 BC13(g) -395 290 H

Answer 1

Ans- Consider the reaction - Bulz ) = BUG) Avap S = Svap. – Slia Avaps = A vopH L Tb Avap S = Entropy change of - Vapowrisation Avaphs Enthalpy of vapowisation To = Boiling point Avaps = Svap. - Sbią = SCBQQgG) – 5°C Baezces) = 290 J moi'k" - 209 I mol'k-1 Ovaps - 815 moi'k/ Aval = H( BC, 2 - H (84,) 2 - 395 KJ moi? – (-418 kJ mo1') = -395 kJ moi' + 418 kJ moi! | ArapH = 23 kJ moi Araps = Avaphy To - Draph = 23X10° Jmort. 283.95k Arops 81 J molta To = 283.95 -273.15 = 10.8°C To = 10.8°C The boiling point (in Oc) is 10.8°C