The following data were recorded in determining the molar mass of a volatile liq

Question

The following data were recorded in determining the molar mass of a volatile liquid following the Procedure of this experiment. Complete the table for analysis. (See Report Sheet.) Record calculate with the correct number of significant figures. Preparing the Sample Mass of dry flask, foil, and rubber band (g) vaporize the Sample Temperature of boiling water(degree c) Mass of dry flask, foil, rubber band, and vapor (g) Determine the volume and pressure of the Vapor Volume of 125 ml, flask (L) Atmospheric pressure (torr. atm) Calculations Moles of vapor, m vapor(mo/) Equation 12.1. Show calculation. Mass of vapor, m vapor (g) Show calculation, Molar mass of vapor (g/mol) Show calculation. For Trials 2 and 3. the molar mass of the vapor was determined to be 46.5g/mol and 43.1 g/mol respectively. What is the average molar mass of the vapor? Data Analysis, B. What are the standard deviation and the relative standard deviation (%RSD) for the molar mass of the vapor? Data Analysis. C and D.

Explanation / Answer

Answer:

Molar mass of the vapour = 46.5 grams/mol and 43.1 grams/mol

Average molar mass of vapour = (46.5 + 43.1)/2

= 44.8 grams/mol

Standard deviation = (Average molar mass*100)/Actual molar mass

For the molar mass= 46.5 grams/mol

= (44.8*100)/46.5

=96.3% , it is -3.7%deviated from standard value

For the molar mass= 43.1 grams/mol

=(44.8*100)/43.1

=103.9, it is +3.9% deviated from standard value.

Relative deviation of molar mass = (Lower value*100)/higher value

= (43.1*100)/46.5

= 92.7%

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