Liquid toluene (C6H5CH3) was stored at 6.4°C in an open top 30-cm-diameter cylindrical Container. The vapor pressure of toluene at 6.4°C is 10 mm Hg. A gentle stream of fresh air at 6.4°C and 101.3 kPa was allowed to flow over the open end of the Container. The rate of evaporation of toluene into air was measured to be 80 g/day. Estimate the concentration of toluene (in g/m3) at exactly 10 mm above the liquid surface. The diffusion coefficient of toluene at 25° C is DAB = 0.084 × 10–4 m2/s.
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