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Principle of chromatography - Purification of organic compounds
The method of chromatography is based on the difference in the rates at which the components of a mixture move through a porous medium (called stationary phase) under the influence of some solvent or gas (called moving phase). So, this technique contains two phases- one is a stationary phase of large surface area whereas the second is a moving phase which is permitted to move slowly over the stationary phase. The stationary phase is either a liquid or a solid when the moving phase may be a liquid or a gas.
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The mass of a photon with a wavelength equal to 1.54 x 10 -8 cm is: (1) 0.8268 x 10 -34 kg (2) 1.287 x10 -33 kg (3)1.4285x 10 -32 k
Take these values into account and comment on the relation between the heat of formation of the gases and the vibrational frequencies again.
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The nitrogen atom has 7 protons and 7 electrons, the nitride ion (N 3 -) will have: (1) 7 protons and 10 electrons (2) 4 protons and 7 electrons (3) 4 protons and 10 e
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