A solution made by dissolving 3.46 g of an unknown compound in 85.0 g of benzene froze at 4.13 °C. What is the molar mass of the compound? The molar mass of the compound = i g mol 1 eTextbook and Media Save for Later Attempts: 0 of 15 used Submit Answer

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A solution made by dissolving 3.46 g of an unknown compound in 85.0 g of benzene froze at 4.13 °C. What is the molar mass of the
compound?
The molar mass of the compound =
i
g mol 1
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Transcribed Image Text:A solution made by dissolving 3.46 g of an unknown compound in 85.0 g of benzene froze at 4.13 °C. What is the molar mass of the compound? The molar mass of the compound = i g mol 1 eTextbook and Media Save for Later Attempts: 0 of 15 used Submit Answer P A O S MacBook Air DII
Expert Solution
Step 1

Given,

Mass of an unknown compound  = 3.46 g

Mass of benzene = 85.0 g = 0.085 Kg

Freezing point of the solution (Tf(solution)) = 4.13°C

Molar mass of the compound = ?

Note:

Freezing point of pure benzene (Tf°(benzene)) = 5.5°C

Freezing point depression constant (Kf) for benzene  = 5.12 °C/m

 Assuming an unknown compound to be non-electrolyte van't Hoff factor (i) =1

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