A mixture with a 50:50 molar ratio of n-pentane and isopentane (i-pentane) is contained in a sealed vessel. Initially the mixture is entirely a liquid at a very high pressure and a temperature of 115°C. While maintaining the temperature constant at 115°C, the system pressure is steadily decreased. Clearly stating all assumptions, please calculate the approximate values of: a. The pressure when the first bubble of vapour is formed. b. The composition of the first bubble of vapour. C. The pressure at which the last drop of liquid is vapourized. d. The composition of the last drop of liquid.

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