New answers tagged molecules
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Inelastic collisions are such collisions, that dissipate mechanical energy to other energy forms. It may be e.g. acoustic energy, light, thermal energy ( in macro context only ) or internal energy of an object.
The change of the internal energy in molecular context can be creation/breaking of chemical bonds, or changes of electron energy states. In usual ...
1
One mole of a compound does not have $\ 6.02· 10^{23}$ atoms, as you say.
One mole of a compound has $\ 6.02· 10^{23}$ molecules
One mole of water has $\ 6.02· 10^{23}$ molecules H2O, and $\ 3 · 6.02· 10^{23}$ atoms.
One mole of H2O has $\ 6.02· 10^{23}$ atoms O, and $\ 2·6.02· 10^{23}$ atoms H.
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To answer your question, what makes a compound a dehydrating agent is, in my opinion, stability, a good affinity for water and possibly inertness (or in special cases, selective activity but in reforming a designated salt, see example below).
Now, $\ce{P2O5}$ is a white powder that loves water, in fact, it reacts violently and exothermically with water ...
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