AVOGADROS NUMBER

In terms of moles, Avogadro s hypothesis can be stated The same volume is occupied by one mole of any gas at a given temperature and pressure. The number of molecules in one mole is known as the Avogadro number constant. ... 

Suppose we wish to evaporate one mole of water, as expressed in equation (7). One mole contains the Avogadro number of molecules (6.02 X 1023) and has a weight of 18.0 grams. Using a calorimeter, as you did in Experiment 5, you could measure the quantity of heat required to evaporate one mole of water. It is 10 kilocalories per mole. This value is called the molar heat of vaporization of water. This is the energy required to separate 6.02 X 1023 molecules of water from one another, as pictured in Figure 5-1. 

We can now apply our knowledge of partial ionic equations to the subject of equivalents. The standard oxidation-reduction process is H H+ + e, where e represents an electron per atom, or the Avogadro number of electrons per mole. If we know the change in the number of electrons per ion in any oxidation-reduction reaction, the equivalent may be calculated. The equivalent of an oxidant or a reductant is the mole divided by the number of electrons which 1 mole of the substance gains or loses in the reaction, e.g. ... 

From the transition-state theory the reaction rate is represented by Equation 3, where Nj is Avogadro number and h is Plank s constant ... 

If we consider an assembly of N molecules, each individual molecule may exist either in the HS state or in the LS state, the transformation for a fixed set of values of the external variables T, p, or x being characterized by Eq. (2). Here, N is the Avogadro number and the Gibbs free energy G per mole of the system may be expressed as ... 

Hj- numerical factor indicating the occurrence of a fragment in a structure fj+ average number of bound protons Na- Avogadro number... 

N normality Avogadro number (6.022 1023 molecules mol1) n number of electrons in a redox system... 

Here ei and e2 are the unit vectors of oscillator 1 (the diene chromophore) and 2 (the C-CH3 dipole), respectively R12 is the vector joining their midpoints, G12 is the point-dipole interaction term and N is the Avogadro number all quantities are expressed in c.g.s. units. In the absorption region of the chromophore, where the perturber does not show a significant absorption, the above formula reduces to the simpler equation410... 

N = Avogadro number h = Planck constant c = velocity of light... 

Given that the molecular weight is 226 and the Avogadro number is 6.023(10 ) atoms/mol, find the half time. 

The number of elementary entities in 1 mol is an experimentally determined quantity, and is called the Avogadro constant L, which has the value 6.022 x 1023 mol-1. The Avogadro constant is also (incorrectly) called the Avogadro number . It is... 

In Worked Example 9.3, we calculated that each photon has an energy of 1.99 x 10-15 J. To convert from the energy per particle to the energy per mole, we multiply the answer by the Avogadro number, L = 6.022 x 1023 mol-1 ... 

We will perform a simple calculation in two parts. First, we will divide by the Avogadro number to obtain the energy per bond. Second, we convert the energy to a wavelength X with the Planck-Einstein relation (Equation (9.4)), E = hc/X. 

We calculate the number of molecules by multiplying nm by the Avogadro number L. We already know the area over which the monolayer forms via nr2, so we calculate the area per molecule with the following simple calculation ... 

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