Chemistry, 20.09.2020 02:01 zanestone12

The vapor pressure of carbon disulfide is 355.6 torr at 25°C. What is the vapor pressure of a solution prepared by dissolving 10.60 g naphthalene (C10H8, Molar Mass = 128.2 g/mol) in 155 mL CS2 liquid (Molar Mass = 76.14 g/mol, density = 1.261 g/mL)? Assume the solution obeys Raoult's law, and treat naphthalene as a nonvolatile solute.

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Answer from: keldrykmw4

The vapor pressure of the solution would be as follows:

344.5764 torr

Given that,

Vapor pressure of Carbon Disulfide = 355.6 torr

volume = 155mL ;

density = 1.261 g/mL

Naphthalene's mass = 10.60 g

Naphthalene's molar mass = 128.2g/mol

Now,

We know that

Number of moles = mass/molar mass

Mass = density × volume

Number of moles = (density × volume) / molar mass

So,

Number of moles of Carbon Disulfide = (1.261 × 155) / 76.14

= (195.455 / 76.14)

= 2.567 moles of Carbon Disulfide

Number of moles of Naphthalene:

Number of moles = 10.60 / 128.2

= 0.083

Now,

Total number of moles :

2.567 + 0.083

= 2.65 moles

Mole fraction of each compound in solution :

Carbon Disulfide:

2.567 / 2.65

= 0.969

Naphthalene

0.083 / 2.65

= 0.031

According to Raoult's:

P solution = Xsolvent × Posolvent

Carbon Sulfide = Solvent

Xsolvent = Mole fraction of solvent

Posolvent = Vapour pressure of the pure solvent

Psolution = 0.969 × 355.6 torr

= 344.5764 torr

Thus, " 344.5764 torr" is the correct answer.

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Answer from: devaughnnorthcu1565

344.5764 torr

Explanation:

Molar mass of naphthalene = 128.2g/mol

Mass of naphthalene = 10.60 g

Carbon disulfide:

Molar mass= 76.14g/mol ;

volume = 155mL ;

density = 1.261 g/mL

Vapour pressure = 355.6 torr

Number of moles = mass / molar mass

CS2:

Mass = density × volume

Number of moles = (density × volume) / molar mass

Number of moles = (1.261 * 155) / 76.14 = (195.455 / 76.14) = 2.567 moles of CS2

Number of moles of C8H10:

Number of moles = 10.60 / 128.2 = 0.083 C8H10

Total number of moles :

2.567 + 0.083 = 2.65 moles

Mole fraction of each compound in solution :

CS2 :

2.567 / 2.65 = 0.969

C8H10:

0.083 / 2.65 = 0.031

According to Raoult's:

Psolution = Xsolvent × Posolvent

CS2 = solvent

Xsolvent = Mole fraction of solvent

Posolvent = Vapour pressure of pure solvent

Psolution = 0.969 × 355.6 torr = 344.5764 torr

Answer from: Quest

a c d and f

just finished the assignment

Answer from: Quest

Spontaneity tell us the direction of the reaction, but not how fast it goes. gibbs free energy brings together enthalpy, entropy and temperature in one easy formula. g = h - ts. and, finally the sign of delta g is always negative for a spontaneous reaction.

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The vapor pressure of carbon disulfide is 355.6 torr at 25°C. What is the vapor pressure of a soluti...

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