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1 July, 10:25

The vapor pressure of diethyl ether (ether) is 463.57 mm Hg at 25 °C. A nonvolatile, nonelectrolyte that dissolves in diethyl ether is aspirin. Calculate the vapor pressure of the solution at 25 °C when 14.88 grams of aspirin, C9H8O4 (180.1 g/mol), are dissolved in 269.2 grams of diethyl ether. diethyl ether = CH3CH2OCH2CH3 = 74.12 g/mol.

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  1. 1 July, 11:09
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    The vapor pressure of diethyl ether (ether) is 463.57 mm Hg at 25 °C. A nonvolatile, nonelectrolyte that dissolves in diethyl ether is aspirin. Calculate the vapor pressure of the solution at 25 °C when 14.88 grams of aspirin, C9H8O4 (180.1 g/mol), are dissolved in 269.2 grams of diethyl ether. diethyl ether = CH3CH2OCH2CH3 = 74.12 g/mol.

    mol of C4H10O = mass of C4H10O / molar mass of C4H10O

    = 242.1 g / 74.12 g/mol

    = 3.266 mol

    mol of C9H8O4 = mass of C9H8O4 / molar mass of C9H8O4

    = 10.33 g / 180.1 g/mol

    = 0.05736 mol

    mole fraction of C4H10O,

    X = mole of CHH1O0 / total mol

    = (3.266) / (3.266 + 0.05736)

    = 0.9827

    now use:

    P = Po*X

    P = 463.57 * 0.9827

    = 455.6 mm Hg
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