Experiment 12 Report Sheet Molar Mass of a Volatile Liquid Preparing the Sample

Question

Experiment 12 Report Sheet Molar Mass of a Volatile Liquid Preparing the Sample Unknown number Trial 1 Trial 2 Trial 3 Mass of dry flask, foil, and rubber band (g) Vaporize the Sample Instructor's approval of apparatus Temperature of boiling water(degree C, K) 3. Mass of dry flask, foil, rubber band, and vapor(S) C. Determine the Volume and Pressure of the Vapor Volume of 125-mL flask (L) = total volume Atmospheric pressure (torr,atm) D. Calculations 1. Moles of vapor, n vapor (mol) 2. Mass of vapor, m vapor (g) 3. Molar mass of compound (g/mol) 4. Average molar mass (g/mol) Data Analysis, B 5. Standard deviation of molar mass Data Analysts, C Relative standard deviation of molar mass (%RSD) Data Analysis, D Show the calculation for the standard deviation and the relative standard deviation (as %RSD) of the molar mass of the unknown. Data Analysts, C and D.

Explanation / Answer

For ideal gas

PV = nRT

R=gas constant =0.082 L atm K1 mol1.

P=1atm V=300ml= 0.03L T= 371.36K

n= mole of vapour= PV/RT = 1x0.03/ 0.082x371.36 = 0.03/30.452=9.8x10^4mol

mass of vapour= 164.38- 164.348 +164.48-164.38 + 164.6-164.348 = 0.032 +0.132+0.252=0.416 g

molar mass of compund= mass/mole=424.489g/mol

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