Hexane has a density of 0.66 g/mL and is also insoluble in water. Would hexane float on water or sink beneath water when mixed with water?

Question

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Answer 1

If the density of hexane exceeds the density of water, it will sink.  If the density of hexane equals the density of water, it may be suspended under the surface of the water.  If the density of hexane is less than the density of water, it will float on the surface of the water.  So to answer your question, just compare the two densities, and decide which case applies.