# Lab - Introduction This certain experiment was designed to...

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Introduction: This certain experiment was designed to determine the actual size of a single molecule in different substances. Using the spherical and cubical equation to find the size of a molecule: (spherical model) Diameter of molecule = (cubical model) Length of a molecule = Where is the packing coefficient, M is the molar mass of the substance, is the density of the substance in grams per cm 3 , and is Avogadro’s number, 6.02 x 10 23 . With all these elements, we can use these measurements to eventually find the actual size of a molecule. The size of water molecules, Carbon dioxide gas molecules, and dry ice solid molecules were determined by gathering the measurements of these samples and then finally estimating their molecular sizes using the spherical and the cubical model. Procedure: 1. First a sample of Cu and a sample of Al metal was weighed on an electronic balance, and recorded in Data table 2. 2. Using the water displacement technique, the volume of each metal sample was also measured and recorded, using a 25 ml graduated cylinder and slowly putting the sample into the cylinder. A buret was filled with 20 ml of water and fixed at the ring stand with a clamp. 15.0 ml of water was added from the buret to the graduated cylinder with the metal sample in it. The final reading of the water volume (V final) in the graduated cylinder was also measured and recorded. The volume of the metal sample was concluded by subtracting 15.0 ml from the final reading of the water and the metal.

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• Fall '09
• Dill
• Atom, dry ice

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