which pair of substances are most likely to obey Raoult's Law?

C5H12 and C6H14
H3PO4 and H20
C4H9COOH and C5H12
C5H12 and H20
C4H9COOH and H20

How do I go about figuring this out? What should I be comparing, differences in molar masses, polarity, etc...?

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  1. I would choose substances that are alike in ability to dissove miscibily.

    Pentane and water is no..for example.

    Butanoic acid and pentane is another not likely to dissolve.

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