Question

Vapour pressures of chloroform and dichloromethane are 200mm of hg and 415mm of hg at 298k respectively. Which one is more volatile?

Answer 1

from the diagram above you can clearly see that if the solution is more volatile than vapourpressure would be more too ..

so dichloromethane has vapourpressure more than chloroform... so it is clear than dichloromethane is more volatile(converts into vapour and adds vapour pressure) ...

hope this would help you

Answer 2

Vapour pressure of dichloromethane is more and thus is more volatile.

Explanation:

Vapor pressure is defined as the pressure exerted by the vapors over the surface of liquid in which it is in equilibrium with. Vapor pressure depends on the strength of intermolecular forces between particles.

Nature of liquid affects the vapor pressure. Weaker are the inter molecular forces, greater is the amount of vapor because more molecules can leave the liquid and come into vapor phase and is more volatile.

The lesser are the forces among molecules, the more volatile the substance is and thus will generate more vapor pressure. Thus dichloromethane with higher vapor pressure of 415 mm Hg is more volatile.

Learn more about vapor pressure

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