fan unknown volatile liquid was placed in a flask with a total volume of 265.0 m

Question

fan unknown volatile liquid was placed in a flask with a total volume of 265.0 mL. The cover of the flask has only a nternal pressure to equilibrate with the outside pressure. The temperature was raised to 100.00°C by placing the flask in a constant temperature water bath. At this temperature, it was found that only 0.581 g of the liquid substance remained in the flask. A barometer in the lab showed the pressure to be 752 mmHg. What's the molar mass of the unknown liquid? (15 points) pinhole, which allows the

Explanation / Answer

Pressure of the Flask = 752 / 760 = 0.989 atm

Volume of the flask = 265 ml = 0.265 Liter

Temperature = 273 + 100 = 373 K

n= 0.0821 L atm K-1 Mol-1

Formula PV = nRT

Let us calculate the moles

n = PV /RT = 0.989 x 0.265 /0.0821 x 373 = 0.008562 Moles

Molar Mass of the liquid = 0.581 gm / 0.008562 mol = 67.85 gm / mol

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