need ASAP A. Preparing the Sample Unknown number I. Mass of dry flask, foil, and

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need ASAP

A. Preparing the Sample Unknown number I. Mass of dry flask, foil, and rubber band (g B. Vaporize the Sample I. Instractor's approval of apparatus 2. Temperature of hoiling water cC. x) Trial 1 Trial 2 Trial 3 320 qq 353 Mas o d fask. foil nubber hand, andar)6S C. Determine the Volume and Pressure of the Vapor 1. Volume of 125-mL lask () 19 t2 Trinka ?rndi O- 2. Atmospheric pressure (forr, atm D. Calculations 1. Moles of vapor, P(omol) 2. Mass of vapor, mpr () 3. Molar mass of compound (gimol) 4. Average molar mass (g/mol) 5. Standard deviation of molar mass 6. Relative standard deviation of molar mass (%RSD) Dat Dat Dat Show the calculation for the standard deviation and the relative standard deviation (as %RSD) of the molar m unknown. Data Analysis, C and D Experiment 1

Explanation / Answer

For trial 1

Moles of vapor = PV/RT

= 1.002 atm x 0.144 L / (0.0821 L-atm/mol-K x 373 K)

= 0.0047117 mol

Molar mass = 0.334 g / 0.0047117 mol

= 70.887 g/mol

For trial 2

Moles of vapor = PV/RT

= 1.002 atm x 0.147 L / (0.0821 L-atm/mol-K x 372 K)

= 0.0048227 mol

Molar mass = 0.349 g / 0.0048227 mol

= 72.366 g/mol

Average molar mass = (70.887 + 72.366)/2

X = 71.626 g/mol

Standard deviation

= {[(71.626 - 72.366)2 + (71.626 - 70.887)2]/(2-1)}0.5

=[ (0.54686025 + 0.54686025)/1]0.5

= (1.0937205)0.5

S = 1.0458

% RSD = S*100/X

= 1.0458*100/71.626

= 1.460%

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