Activity coefficients at infinite dilution of various solutes in the ionic liquids [MMIM]+[CH3SO4]−, [MMIM]+[CH3OC2H4SO4]−, [MMIM]+[(CH3)2PO4]−, [C5H5NC2H5]+[(CF3SO2)2N]− and [C5H5NH]+[C2H5OC2H4OSO3]−

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