Experimental data is available that shows the excess molar volume of acetone with three different nor mal alkanes at 298.15 K: n-hexane, n-heptane, and n-octane. Each of the three mixtures shows positive excess molar volumes across the entire composition range. Consider their values in Table E9-11 for an equimolar mixture. 

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TABLE E9-11 Excess molar volumes for three n-alkane + acetone equimolar systems at 298.15 K. System VE (cm³/mol) n-hexane + acetone 1.08 n-heptane + acetone 1.14 n-octane + acetone 1.18 Based on data from Marino, G. et al., "Temperature Dependence of Binary Mixing Properties for Acetone, Methanol, and Linear Aliphatic Alkanes (C6-C8)." J. Chem. Eng. Data, 2001, 46, 728, (2010). From an interactions perspective, describe the trend in the data in Table E9-11.