A 1.60 g sample of a mixture of naphtalene, C10H8. and anthracene

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In summary, the conversation discusses a question about the composition (mass percentage) of a mixture of naphtalene and anthracene dissolved in benzene. The freezing point of the solution is given, along with the freezing point of pure benzene and its Kf value. The question is clarified to be asking for the actual mass percentage of each component in the original mixture. The solution method is also provided, which involves dividing the mass of each component by the total mass of the mixture.
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Homework Statement


"A 1.60 g sample of a mixture of naphtalene, C10H8. and anthracene, c14H10 is dissolveed in 20.0g of benzene, C6H6. The freezing point of the solution is 2.81C. Pure Benzene freezes at 5.51C and has a Kf = 5.12C kg/mol. Determine the composition (mass percentage) of naphthalene-anthracene mixture?"

my question is are they asking us for the easy mass composition of the Nap. and ant. mixture over the total mass or are they asking me to find the actual mass % between nap and ant., as in how many grams out of the 1.6 is the mass of nap?

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The Attempt at a Solution


if the question is as easy as it seems:
1.6/21.6 = 7.4%
 
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No, they ask about % composition of the original mixture - how many percent of naphtalene, how many perecent of anthracene.

--
methods
 

1. What is the molecular weight of naphtalene and anthracene?

The molecular weight of naphtalene (C10H8) is 128.17 g/mol and the molecular weight of anthracene (C14H10) is 178.23 g/mol.

2. How can you separate naphtalene and anthracene from the mixture?

Naphtalene and anthracene can be separated from the mixture using a process called sublimation. This involves heating the mixture to a temperature where naphtalene will sublimate (turn directly from a solid to a gas) while anthracene remains in its solid form. The two substances can then be collected and separated.

3. What are the physical properties of naphtalene and anthracene?

Naphtalene is a white, crystalline solid with a distinct odor. It has a melting point of 80.2°C and a boiling point of 218°C. Anthracene is also a white, crystalline solid with a higher melting point of 217°C and a boiling point of 351°C.

4. What are the uses of naphtalene and anthracene?

Naphtalene is commonly used as a moth repellent and in the production of dyes, resins, and plastics. Anthracene is used in the production of dyes, as a precursor for the synthesis of other chemicals, and in the manufacturing of fireworks.

5. How can you determine the percentage of naphtalene and anthracene in the mixture?

The percentage of naphtalene and anthracene in the mixture can be determined through a process called chromatography. This involves separating the mixture by passing it through a medium that will separate the components based on their different affinities for the medium. The separated components can then be quantified to determine the percentage of each substance in the mixture.

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