Freezing point of a given liquid may be defined as the temperature at which the vapour pressure of the liquid and its solid will have same vapour pressure (or vapour pressure-temperature curves of the liquid and its solid intersects each other. How to define vapour pressure of non-volatile solid?
2006-12-22 15:55:29 · 3 answers · asked by nbraj70 1 in Science & Mathematics ➔ Chemistry
VAPOUR PRESURE is the pressure of a vapor in equilibrium with its non-vapor phases.
All solids and liquids have a tendency to evaporate to a gaseous form, and all gases have a tendency to condense back. At any given temperature, for a particular substance, there is a partial pressure at which the gas of that substance is in dynamic equilibrium with its liquid or solid forms. This is the vapour pressure of that substance at that temperature.
2006-12-22 16:04:37 · answer #1 · answered by Som™ 6 · 0⤊ 0⤋
By definition, a non-volatile solid has a vapor pressure of zero.
Apart from this, you can use the concept of fugacity (look it up on Wikipedia if you haven't heard the word before) to determine the vapor pressure of a solid. Typically, fugacity data is superior to vapor pressure for use in equilibrium data, especially when you are working with systems that are non-ideal, or have more than one component.
2006-12-22 16:48:32 · answer #2 · answered by laboratory.mike 2 · 0⤊ 0⤋
first find mols of water and moles of urea ie. 256g/18.02g/mol and 49g/60.06g/mol then find mole fraction of solvent (ie. water) ---->>>> mols water/(mols water+mols urea) then, P of solution = mole fraction * P solvent (this is given= 187.5)
2016-05-23 00:58:55 · answer #3 · answered by Anonymous · 0⤊ 0⤋