Can you please tell me where the -.1501 comes from? Thanks Solutions to some of

Question

Can you please tell me where the -.1501 comes from?

Thanks

Solutions to some of the problems of this chapter require vapor pressures as a function of temperature for species which constitute systems in VLE. Table B.2, Appendix B, lists parameter values for the Antoine equation, ln P^sat/kPa = A - B/t/degree C + C Assuming the validity of Raoult's law, do the following calculations for the benzene(1)/toluene(2) system: Given x_1 = 0.33 and T = 100 degree C, find y_1 and P. Given y_= 0.33 and T = 100 degree C, find x_1 and P. Given x_1 = 0.33 and P = 120 kPa, find y_1 and T. Given y_1 = 0.33 and P = 120 kPa, find x_1 and T.

Explanation / Answer

Here - 0.1501 is the difference in the Antonie parameter, A (A1 - A2 = - 0.1501) value for the two equations in which we substituted T.

lnP1 = A1 - [2726.81 / (T+217.572)] ----- (1)

lnP2 = A2 - [3056.96 / (T+217.625)] ----- (2)

(1) - (2) =>

ln(P1/P2) = (A1 - A2) - [2726.81 / (T+217.572)] + [3056.96 / (T+217.625)]

=> ln(P1/P2) = - 0.1501 - [2726.81 / (T+217.572)] + [3056.96 / (T+217.625)]

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