A binary solution of Ethanol and n-Heptane is an example of
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the interaction between n - heptane and ethanol are smaller than those in ethanol.
hence, solution show +ve deviation.
n+heptane is non-polar and ethanol is polar.
hence in the mixture formed by these two liquids is non-ideals.
the stronger forces of attraction between n-hepane - n-hepane and ethanol- ethanol are replaced by weaker forces of attraction between n-hepane-ethanol in the solution.
therefore the escaping tendency of the liquid molecules into the vapour pressure more than expected from raourt's law.
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