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23 Nov 2019

A mixture is prepared that is 5.0% (w/w) of an unknown substance mixed with naphthalene (molar mass = 128.2 g mol-1). The freezing point of this mixture is found to be 77.3 °C. What is the molar mass of the unknown substance? (The melting point of naphthalene is 80.2 °C and Kf = 6.9 °C m-1.)

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1 May 2019
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Related questions

Pure benzene, C6H6, has a molar mass of 78.114 g/mol, a density of 0.8765 g/ml, a freezing point of 5.45°C, and a boiling point of 80.2°C. Its freezing point depression and boiling point elevation constants are: Kf = 5.07°C/; Kb = 2.53oC/m. A solution was made by taking 33.88 g of an unknown nonelectrolyte and dissolving it in 175.0 g of benzene. The measured freezing point of the solution was 1.65oC. Calculate the molar mass of the unknown substance.

What is the molar mass of 35.0 g of an unknown substance that depresses the freezing point of 0.350 kg of water 0.50 °C? Kf for water is 1.86 °C/m.

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qustion 1 a) cyclohexane (C6H12) freezes at 6.55 degree celsius. A solution of 1.67 g of carbon disulfide (CS2) in 50.0 g of cyclohexane freezes at negative 2.25 degree celsius. what is the freezing point depression constant for cyclohexane.

b) if 1.09 g of a substance is dissolved in 14.06 g of naphthalene, the freezing point is lowered from 80.2 to 75.1 degree celsius. the freezing point depression constant for napthalene is 6.9 degree celsius/m . what is the molecular weight of the substance?

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