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State the useful rule related to the sol...

State the useful rule related to the solubility of a compound. Unlike ethane, ethanol dissolves in water. Explain and discus in terms of energy change.

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The useful rule relevant to the solubility of a compound is "like dissolves like" which means a polar solute dissolves in polar solvent & a non-polar solute dissolves in non-polar solvent.
Ethanol molecules get involves n intermolecular H-bonding with water molecules. so ethanol redily dissolves in water. on the other hand, non-polar ethane `(CH_(3)CH_(3))` molecules are not capable of forming H-bonds with water molecules and so ethane does not dissolve in water.
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  • When a compound A is heated, it produces a colourless gas and the residue obtained is dissolved in water to form the compound B. The compound C is formed when excess CO_2 is passed through aqueous solution of B. The compound C can be separated out in solid state from its solution. C in its solid state when heated forms the compound A. A is-

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