Weight of structure

Authors concluded, that although the swelling degree is not directly connected with molecular characteristics of absorbed liquids, however determining factor is their parameter of solubility in spite of the fact that at detailed consideration of the dependencies Q =f(3) (or f(32)) there are a number of deviations (as same as in the work [5]) from the ideal curve for many solvents. It is necessary to notify that although it is hard to estimate the verisimilitude of determined in such a way molecular weights of structural links of a coal between the points of cross bonds, however, in a case of synthetic polymers in a same way determined masses of links visible don t agree with the values obtained in accordance with others methods. 

The weights of structures in an orthogonal case are defined simply as w I) = c/p. However, some ambiguity is inevitable in the nonorthogonal case, because of the nonvanishing overlap matrix, (S)// = P/ P/). 

Danielssok [23] have shown that the weight of structure (iv) is quite sensitive to the nature of the oxygen orbitals used, though the general pattern of variation of the weights with 0,—H and H 02 distances is always similar. 

Table LXXVllI, Dipole Moments and Weights of Structures...

Bond Dipole moment D Intemudear distance A Weight of structure per cent ... 

Relative weight of structures within a family of structures... 

Note The expressions for X, M , and derived above for the simple case of equal molecular weights of structural units are identical with the corresponding expressions for the A—B system. Expressions, though more involved, can be readily derived for a system with unequal structural unit molecular weights. 

Table LXXVIII gives the dipole moments and the calculated weights of structures for the hydrogen halides. The data show, in agreement with the chemical behaviour, the increasing homopolar nature of the bond in the series, HF, HC1, HBr, HI, the transitional structure in each step making a greater contribution than the ionic structure.

Structure indicates, since the shape of the mole-Weight of structure cule w ll be a trigonal pyramid as in NH . that the N—F bond is... 

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