1) How many moles of a gas fill a flask with a volume of 247mL at 102 degrees C

Question

1) How many moles of a gas fill a flask with a volume of 247mL at 102 degrees C and a pressure of 774 torr? 2) If a student finds the molecular weight of an unknownliquid to be 142g/mol and the molecular formula of liquid isCHCl3,what is the percent error in the student'smolecular weight? 1) How many moles of a gas fill a flask with a volume of 247mL at 102 degrees C and a pressure of 774 torr? 2) If a student finds the molecular weight of an unknownliquid to be 142g/mol and the molecular formula of liquid isCHCl3,what is the percent error in the student'smolecular weight?

Explanation / Answer

We Know that :

     According to ideal gas Equation :

         PV = nRT

       774 / 760 x 247/ 1000 = n x 0.0821 atm -L / mole - K x 375 K

           n = 0.0081 moles

     The molecular weight ofCHCl3 is 119.5 gm / mole

        % error in thecalculation of molecular weight is :

           (142 - 119.5 / 119.5 )*100

         = 18.8%

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