The molar mass of an unknown organic liquid (M - 100) is determined by placing 5 mL of the liquid in a weighed 125-mL conical flask fitted with a piece of Al foil with a pin hole in it. The flask is heated in a boiling water bath until the liquid evaporates to expel the air and fill the flask with the unknown vapor at atmospheric pressure. After cooling to room temperature the flask and its contents are reweighed. The

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Chapter1: Chemical Foundations
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The molar mass of an unknown organic liquid
(M - 100) is determined by placing 5 mL of the
liquid in a weighed 125-mL conical flask fitted
with a piece of Al foil with a pin hole in it. The
flask is heated in a boiling water bath until the
liquid evaporates to expel the air and fill the
flask with the unknown vapor at atmospheric
pressure. After cooling to room temperature the
flask and its contents are reweighed. The
uncertainty in which piece of apparatus causes
the largest percentage error in the molar mass?
(A) balance (+0.01 g) (B) barometer (+0.2 mm
Hg) (C) flask (+1.0 mL) (D) thermometer (+0.2 °C)
Please explain reasoning quantitatively and
qualitatively. Thank you!
Transcribed Image Text:The molar mass of an unknown organic liquid (M - 100) is determined by placing 5 mL of the liquid in a weighed 125-mL conical flask fitted with a piece of Al foil with a pin hole in it. The flask is heated in a boiling water bath until the liquid evaporates to expel the air and fill the flask with the unknown vapor at atmospheric pressure. After cooling to room temperature the flask and its contents are reweighed. The uncertainty in which piece of apparatus causes the largest percentage error in the molar mass? (A) balance (+0.01 g) (B) barometer (+0.2 mm Hg) (C) flask (+1.0 mL) (D) thermometer (+0.2 °C) Please explain reasoning quantitatively and qualitatively. Thank you!
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