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ryanmorse01
25.02.2020 •
Chemistry
The common laboratory solvent benzene is often used to purify substances dissolved in it. The vapor pressure of benzene , C6H6, is 73.03 mm Hg at 25 degrees Celsius.
In a laboratory experiment, students synthesized a new compound and found that when 18.16 grams of the compound were dissolved in 228.6 grams of benzene, the vapor pressure of the solution was 71.88 mm Hg. The compound was also found to be nonvolatile and a non-electrolyte.
What is the molecular weight of this compound ?
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Ответ:
Molecular weight of this compound is 387.3g/mol
Explanation:
As the relative lowering of vapor pressure is directly proportional to the amount of dissolved solute.
The formula for relative lowering of vapor pressure will be,
where,
i = Van'T Hoff factor = 1 (for non electrolytes)
Given : 18.16 g of compound is present in 228.6 g of benzene
moles of solute =![\frac{\text{Given mass}}{\text {Molar mass}}=\frac{18.16g}{Mg/mol}](/tpl/images/0523/5597/f92b7.png)
moles of solvent (benzene) =![\frac{\text{Given mass}}{\text {Molar mass}}=\frac{228.6g}{78g/mol}=2.93moles](/tpl/images/0523/5597/a1d84.png)
The molecular weight of this compound is 387.3g/mol
Ответ:
increased susceptibility to disease
Explanation: