Suppose 1,2-dimethylbenzene(A) and 1,3-dimethylbenzene(B) can form ideal solution. 1) Calculate the Gibbs energy, entropy, and enthalpy of mixing when 1.00 mol of A is mixed with 3.00 mol of B at 298 K. Explain if the mixing process occurs spontaneously? 2) At 90°C, the vapor pressure of 1,2-dimethylbenzene(A) is 20 kPa and that of 1,3-dimethylbenzene(B) is 18 kPa. Find the composition of a liquid mixture (ideal solution) that boils at 90°C when the total pressure is 19.5 kPa. What is composition of the vapor (YB)?

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