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If \( \mathrm{D}_{\mathrm{T}} \) and \( \mathrm{D}_{\mathrm{O}} \) are the theoretical and observed vapour densities at a definite temperature and \( \alpha \) be the
\( \mathrm{P} \)
degree of dissociation of a substance. Then, \( \alpha \) in
W
terms of \( \mathrm{D}_{\mathrm{O}}, \mathrm{D}_{\mathrm{T}} \) and \( \mathrm{n} \) (number of moles of products formed from 1 mole reactant) is calculated by the formula:
(1) \( \alpha=\frac{\mathrm{D}_{\mathrm{o}}-\mathrm{D}_{\mathrm{T}}}{(1-\mathrm{n}) \mathrm{D}_{\mathrm{T}}} \)
(2) \( \alpha=\frac{D_{\mathrm{T}}-\mathrm{D}_{\mathrm{O}}}{(\mathrm{n}-1) \mathrm{D}_{\mathrm{T}}} \)
(3) \( \alpha=\frac{D_{T}-D_{O}}{(n-1) D_{O}} \)
(4) \( \alpha=\frac{D-D_{T}}{(n-1) D_{T}} \)
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