Brass weights are used to weigh an aluminum object on an analytical balance. The weighing is done one time in dry air and another time in humid air, with a water vapor pressure of ρh = 2.00 • 103 Pa. 1 he total atmospheric pressure (P = 1.00-105 Pa) and the temperature (T = 20.0 °C) are the same in both cases. What should the mass of the object be to be able to notice a difference in the balance readings, provided the balance's sensitivity is m0 = 0.100 mg? (The density of aluminum is ρA = 2.70 • 103 kg/m3; the density of brass is ρB = 8.50 • 103 kg/m3.)
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