HW1-2019 (2).pdf - ECH 152B Winter 2019 Ambarish Kulkarni...

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ECH 152B, Winter 2019, Ambarish Kulkarni & Roland Faller Homework 1, January 9, 2018 Due: January 16, 8am via Canvas 1. (4 points) Assume a benzene(B)–toluene(T) mixture obeys Raoult’s law. Calculate (a) y B and P if x B = 0 . 45 and T = 500 K (b) x T and T if y B = 0 . 42 and p = 120 kPa y is the (molar) concentration in the vapor phase, x is the same in the liquid phase. Specify in each case what type of calculation you are doing. (c) Give a short reason why or why not Raoult’s law is a good approximation for this system at these conditions. You have to find the dependence of saturation pressure versus temperature. Be careful of the units being used. Always cite all your sources. 2. (4 points) Define an azeotrope. Show mathematically that an ideal system (i.e. a system obeying Raoult’s law) cannot exhibit an azeotrope. Also explain

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