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Avogadro constant - gas The mole is a measure of the number...

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Avogadro constant The laws of classical thermodynamics do not show the direct dependence of the observed macroscopic variables on microscopic aspects of the motion of atoms and molecules. It is however clear that the pressure exerted by a gas is related to the linear momentum of the atoms and molecules, and that the temperature of the gas is related to the kinetic energy of the atoms and molecules. In relating the effects of the motion of atoms and molecules to macroscopic observables like pressure and temperature, we have to determine the number of molecules in the
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Unformatted text preview: gas. The mole is a measure of the number of molecules in a sample, and it is defined as " the amount of any substance that contains as many atoms/molecules as there are atoms in a 12-g sample of 12 C " Laboratory experiments show that the number of atoms in a 12-g sample of 12 C is equal to 6.02 x 10 23 mol-1 . This number is called the Avogadro constant , N A . The number of moles in a sample, n, can be determined easily:...
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