Question

Problem 2: a) Find the dimensionless Henry's Law constant for (i) phenanthrene and (ii) TCE (hint: use the solubility and vapor pressure to estimate Henry's law constant). (b) Which compound is more volatile? Justify your answer using the vapor pressure and Henry's constant values. Phenanthrene | TCE Solubility (mol/L) 6.3E-6 | 8.32E-3 Vapor Pressure (atm) | 2.2E-7 9.87E-2

Answer 1

solution : Acconding to Henry's lawi - «Р g= Solubility 1 Pg = vapour pressure Henry's law constant for Phenanthrene: : Kuphem). G They) 63x10-6 mál. [-4 - 212x10-7 atm - 28.64 mod.14, atmt Henry's law constant for TCE : Kuffek) = g(C$) Pg (ICE) 8132x10-3 molila 9,87 *10-2 atm 20.084 mol, Lt, atmy ne Porphen)

W Vapour pressure in a measurement of volatility, so in Henry's constant. TEE has a lower value of kn which means it has len solubility than Phenanthrene. Therefore TCE in more volatile. In fact it falls under the volatile organic compounds (roe) category ahereas Phenanthrene 1. is a semi volatile compound.