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An open vessel containing (a) water, (b) benzene, (c) mercury stands in a laboratory measuring 6.0 m x 5.3 m x 3.2 m at 25 deg celsius. What mass of each substance will be found in the air if there is no ventilation? (The vapour pressures are (a) 24 Torr, (b) 98 Torr, (c) 1.7 mTorr)

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