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The present "simple" type of problem is one where an assemblage of ions is equilibrated to a fixed relative humidity, and the partial pressures of trace gases that would exist above the condensed phase are reported. In this case the scaling of the numbers of moles does not affect the result. Thus, for a fixed relative humidity of 0.515 at 298.15 K, equilibrating 2 moles of H+ and 1 of SO42−, or 2x10-6 moles H+ and 1x10-6 moles SO42−, gives the same answer: an aqueous solution of about 7.5 molal H2SO4.