Please show all your work! 1. Applying Henry?s Law A 2 L jar, equipped with a ti

Question

Please show all your work!

1. Applying Henry?s Law A 2 L jar, equipped with a tight-fitting lid that contains a rubber septum, is half filled with water. At equilibrium, the air space has a volume of I L, a total pressure of 1 atm, and a temperature of 298 K. Then, I mg of trichloroethylene is injected through the septum into the water. Some of the TCE escapes into the gas phase. Consider the situation when a new equilibrium is established. Determine: (a) The equilibrium mass concentration of TCE in water (b) The equilibrium mole fraction of TCE in air DATA for trichloroethylene (TCE) Formula: C2HCI3 Solubility: 1,100 mg/L Henry?s constant: Kn= 0.1 M/atm

Explanation / Answer

Henry s Law -

"At a constant temperature, the amount of a given gas that dissolves in a given type and volume of liquid is directly proportional to the partial pressure of that gas in equilibrium with that liquid."

An equivalent way of stating the law is that the solubility of a gas in a liquid is directly proportional to the partial pressure of the gas above the liquid.

P = Kh C

MW of C2HCl3=131.2 mole of C2HCl3=1x10^-3 / 131.2=0.00762x10^-3

a) C=0.00762x10^-3 mol / l

b) P=KhC =0.1x 0.00762x10^-3 = 0.000762x10^-3

Xi (mole fraction ) = Pi(partial pressure) / P(total pressure) = 0.000762x10^-3 / 1=76x10^-8

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