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Unformatted text preview: large, relative to going from an even to the next odd numbered alkane. pentane hexane heptane octane mp ( o C)-130 -95 -91 -57 ! = 35 ! = 4 ! = 34 It has been suggested that these melting point anomalies are due to variable packing forces in the solid state . Methane and ethane have higher melting points than propane because they are more compact and pack better in the solid state. Alkane chains with an even number of carbons pack more closely in the solid state. The resulting stronger attractive forces lead to higher melting points. Density and Solubility All alkanes and cycloalkanes have densities less than the density of water (1.00 g/mL at 4 o C), and are insoluble in water . Since they are nonpolar materials, they dissolve well in other nonpolar or low polarity organic solvents....
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