Asolution contains naphthalene (c10h8) dissolved in hexane (c6h14) at a concentration of 10.00 % naphthalene by mass. part a calculate the vapor pressure at 25 ∘c of hexane above the solution. the vapor pressure of pure hexane at 25 ∘c is 151 torr.

The vapor pressure at 25°C of hexane : 140.52 torr

Solution properties are the properties of a solution that don't depend on the type of solute but only on the concentration of the solute.

Solution properties of electrolyte solutions differ from non-electrolyte solutions because electrolyte solutions contain a greater number of particles because electrolytes break down into ions. So the Solution properties of electrolytes is greater than non-electrolytes.

The term is used in the Solution properties

the ratio of the number of moles of solute to the mole of solution

Vapor pressure depends on the mole fraction of the components in the solution

P = Xs. P °

P = vapor pressure solution

P ° = pure vapor pressure of the solvent

Xs = mole fraction solvent

ΔP = P ° - P where

ΔP = change in vapor pressure

We determine the mole fraction of hexane (we consider a 100 g solution)

mass of naphthalene (C₁₀H₈) = 105 = 10 g

molar mass: 128  g/mole

mole: 10: 128 = 0.078

mass of hexane (C₆H₁₄) = 90 g

molar mass: 86  g/mole

mol = 90: 86 = 1.0465

Total mole = 1.0465 + 0.078 = 1.1245

Hexane mole fraction = 1.0465: 1.1245 = 0.9306

vapor pressure hexane = hexane mole fraction. vapor pressure of pure hexane

Phexane = 0.9306 x 151

Phexane = 140.52 torr

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d.) the average kinetic energy of the gas particles is greater in container b because its particles move faster.