Calculate the GMW of the cyclohexane (for each run and the average). the accurac

Question

Calculate the GMW of the cyclohexane (for each run and the average). the accuracy of your results expressed as % error. Answer Explain the effect each of the errors listed would have on your data. In your answer state whether the calculated GMW would be higher or lower than it should be as a result of the error, and why. The sample used was not in the bath long enough to vaporize. The liquid heated contained an impurity which was non-volatile. The second weighing, after heating and cooling, was made without the foil.

Explanation / Answer

PV = nRT

or, n = PV/RT = 1.0123 atm *0.274 L / 0.082 latm/K/mol * 373 K = 9.068*10^-3

moles = mass/molar mass

or, molar mass = mass/moles = 0.90gm/9.068*10^-3 = 99.25 gm/mol

Actual molar mass of cyclohexane = 84.16 g/mol

% error = (99.25 gm/mol-84.16 g/mol/84.16 g/mol) *100 = 17.93 %

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