When two different liquids are mixed or when a gas or solid is dissolved in a liquid, bonds are broken between neighbouring molecules (or sometimes atom) in the feed materials, and new bonds are formed between neighbouring molecules (or ions) in the product solution.

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When two different liquids are mixed or when a gas or solid is dissolved in a liquid, bonds
are broken between neighbouring molecules (or sometimes atom) in the feed materials,
and new bonds are formed between neighbouring molecules (or ions) in the product
solution.


i. Briefly distinguish between heat of solutions and standard heat of formation of solution.

ii. Consider solid X is to be dissolved in solvent Y. If Δ?? °is the heat of formation of X(s),
using the appropriate notations, write an equation to calculate the standard heat of formation of solution that contains 5 mol of X in 100 mol of Y at 25°C, relative to X and Y.

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