A 2 L jar, equipped with a tight-fitting lid that contains a rubber septum, is h

Question

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 1 L, a total pressure of 1 atm, and a temperature of 298 K. The i mg of formaldehyde (HCHO, MW = 30 g/mol) is injected through the septum into the water. Some of the formaldehyde escapes into the gas phase. Consider the situation when a new equilibrium is established. Determine (a) the equilibrium mass concentration of HCHO in water and (b) the equilibrium mole fraction of HCHO in air

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