Lecture Notes--Molecular Weight of a Volatile Liquid

Lecture Notes--Molecular Weight of a Volatile Liquid -...

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CHM1012: Chemical Principles 1 Laboratory CJT 9/09 Lecture Notes: Molecular Weight of a Volatile Liquid Page 1 of 2 Objectives Correctly apply the Ideal-Gas Law for calculation of one variable Manipulate the Ideal-Gas Law to solve for density (d = p M /RT) and molar mass ( M = mRT/pV) Define vapor and what distinguishes it from other phases of matter Important Definitions Volatile : a liquid with high vapor pressure due to its tendency to convert into the gaseous phase Ideal Gas : a medium comprised of tiny particles in constant motion and perfectly elastic collisions Constants & Formulae: R = 0.0821 L atm mol -1 K -1 T K = T C + 273.15 pV = nRT M pV mRT = m condensed liquid = m ( flask+foil+ liquid) – m( flask + foil) p ( atm) = mm Hg x mmHg atm 760 _ 1 Vol (L) = mL mL L 1000 _ 1 Safety glasses must be worn at all times! Assume all unknowns are toxic and flammable Instructions Preparation of the Flask 1.) Assemble the apparatus, as shown by your instructor.
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