- In The Dumas Method For Determining The Molar Mass Of An Unknown Volatile Liquid A Sample Of A Volatile Liquid That Boi 1 (54.02 KiB) Viewed 46 times
In the Dumas method for determining the molar mass of an unknown volatile liquid, a sample of a volatile liquid that boi
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In the Dumas method for determining the molar mass of an unknown volatile liquid, a sample of a volatile liquid that boi
In the Dumas method for determining the molar mass of an unknown volatile liquid, a sample of a volatile liquid that boils below 100°C is vaporized in a boiling water bath and the mass of the vapor required to fill the flask is determined. The following data was collected: Flask Volume 100.0 + 100.0 + 79.6 mL = 279.6 mL 143.85 g Mass of Flask + Cap 144.95 g Mass of Flask + Condensed Liquid Mass of Condensed Liquid 1.10 g 84.1 °C Temperature of Water Bath (°C) Barometric Pressure (atm) 0.985 atm a. What is the molar mass of the unknown? b. What will its temperature be when the pressure is 1.20 atm and the volume is 250.0 mL? Chemical analysis of an unknown compound shows that it contains 64.9% C, 13.5% H, and 21.6% O by mass. At 120°C and 750 mmHg, 2.00 L of the gaseous compound weighs 4.60 g. a. What is the empirical formula of the compound? b. What is the molar mass of the compound? c. What is the molecular formula of the compound?
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