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I was doing some research on enthalpy of water-ethanol mixtures at different ratios, and when looking at all the information graphed, I don't understand why it produces the trend line it does. Why doesn't it produce a 'quadratic' trend line? Shouldn't having a 10:90 water-ethanol exert the same amount of energy that a 90:10 ratio would?

The graph in question: https://i.stack.imgur.com/lgSbi.png

Thanks.

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# Enthalpy of water / ethanol at different ratios -- trend?

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