The total pressure of vapor over liquid acetic acid at 71.3°C is 146 mmHg. If the density of the vapor is 0.702 g/L, what is the mole fraction of dimer in the vapor? See Problem 11.149.
Problem 11.149
Acetic acid, CH3COOH, forms stable pairs of molecules held together by two hydrogen bonds.

Such molecules€”themselves formed by the association of two simpler molecules€”are called dimers. The vapor over liquid acetic acid consists of a mixture of monomers (single acetic acid molecules) and dimers. At 100.6°C the total pressure of vapor over liquid acetic acid is 436 mmHg. If the vapor consists of 0.630 mole fraction of the dimer, what are the masses of monomer and dimer in 1.000 L of the vapor? What is the density of the vapor?

Transcribed Image Text:

H-C-C C-C-H O-H O