you are told to prepare a closed experimental environment (a box) for student mice. the box volume will be 294 litres (about 10 ft 3 and the entire air volume will be changed every minute. the relative humidity of the air entering the box is to be controlled at 40 % at 21 0c. what weight of H2O must be added to the flow of dry air per minute?
(equilibrium vapour pressure for H2O at 210c = 19 torr)
(R= .082 liter atm mole -1 deg -1)
ANS:- 2.2 gram
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