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7. A mixture of P and Q forms an ideal solution consisting 20.0 g of P and 18.0 g of Q. At temperature 25 C, the vapour pressure of pure P is 32.6 kPa and 30.1 kPa for pure Q. [Molar mass of P = 78 g mol-'; Q = 92 g mol-l] = a. Calculate the number of moles of P and Q. b. Calculate the mole fractions of P and Q. c. Calculate the partial vapour pressure of P and Q and the total pressure. [8 marks]