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m1-akram - Abstract In this experiment the we studied...

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Abstract : In this experiment the we studied molecular diffusion in gases. Dab values were gotten experimentally and theoretically by the use of two different equations. In the experiment the liquid level of each tube was measured different times for 4 different components using a traveling of microscope. Dab values for Acetone, Chloroform, Hexane and Methanol were found experimentally to be 0.1145, 0.0436,0.1150 and 0.7485 cm^2/s respectively. The percentage of errors in the experiment ranged from a high of 57% to a low of 1 %. Introduction : The diffusion coefficient depends upon the pressure, temperature and the composition of the system. As one might expect when considering the mobility of molecules, the diffusion coefficient are generally higher for gases than liquids and that of liquids are higher than solids. The diffusion coefficient for the gas may be experimentally measured in a tube. This tube, which is partially filled with pure liquid(A),is maintained at a constant temperature and pressure. Gas (B), which flows across the open end of the tube, has a negligible solubility in liquid ( A ) and is also chemically inert to ( A ). Component ( A ) vaporizes and diffuses into the gas phase. The rate of vaporization may be measured and may also be mathematically expressed in terms of the molar mass flux..
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