Chem Lab 1

Monday, October 14, 2011
Chemistry II

Purpose: The purpose of this lab was to
Hypothesis: By obtaining the accurate measurements for the ideal gas law I lead be able to determine the molar mass of the unnoticeable semiliquid.
Introduction: In this experiment, the molar mass of the volatile entire liquid will be determined. A volatile liquid is an unstable liquid that evaporates quickly.
PV=nRT
The ideal gas law flock be used to solve for any of the variables, R is the ceaseless so it could not be solved for. It will evermore be .0821. You dont need to solve for obligate because it is given. To find out the temperature, measure how hot the boiling piss is. To find out the volume, measure in a graduated cylinder how much body of water the flask holds. Finally, rearrange the equivalence to solve for moles.
Procedure: The materials were obtained. A 250 mL Erlenmeyer flask with an have stopcock fictionalisation was fill up with 5 mL of a liquid sample. The flask was whence placed directly onto a hotplate until the liquid sample evaporated and there was no ejection seat left on the neck of the flask. Once this happened, the flask was then removed from the hotplate and placed under cold trail water until the vapors inside condensed into a liquid. When the flask was alone cool offed, the stopcock was closed with a clamp and removed from the cool running water. The flask was then dried off and weighed. A sharpie marker was then used to make a mark on the flask where the rubber stopper ended.



After, the stopcock assembly was removed and the flask was rinsed out. The flask was then filled with water up to the sharpie mark and the stopcock assembly was placed back on the flask. This was then weighed and then the water was poured out. The entire process was then repeated once more.
selective information:
Table 1. Mass of empty flask and pinchclip
|Trial keep down |Mass |
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