The vapor pressure of pure water at 30°c is 40 torr. if nacl is dissolved into a sample of water until the total vapor pressure of the mixture at 30°c is 32 torr, what is the mole fraction of nacl?

Mole fraction is 0.2

Explanation:

You have to apply the colligative property about vapour pressure which formula is:

ΔP = P° .Xm

Where ΔP = P° - P

Pressure of vapour from pure solvent (P°) - Pressure of vapour from solution

40 Torr - 32 Torr = 40 Torr . Xm

8 Torr / 40 Torr= 0.2. > Xm

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explanation:

in chemistry, adhesion and cohesion are attractive forces that exist between molecules. they hold the molecules together from each other. they are different in that adhesive force exists between molecules of different substance while cohesive force happens between molecules of same substance.

adhesion between water and glass causes water molecules at the edge of water and glass interface to climb up the wall in a narrow glass tube. this is called capillary action. cohesion is what gives glass its shape and causes water to form a droplet.