Question

Dry air is bubbled through 25 litres of water at a rate of 15 litres (STP)/min....

Dry air is bubbled through 25 litres of water at a rate of 15 litres (STP)/min. The air leaving the liquid is saturated with water at 25 degrees celcius and 1.5 atm. How long it will take for all of the water to vaporize.

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Answer #1

p   = Pdry air + PH2O

Pdry air = p-PH2O

             = 1.5-0.03127   = 1.468atm

   P1V1/T1 = P2V2/T2

V2 = P1V1T2/P2T1

     = 15*1*298/1.468*273   = 11.1L/min

PV = nRT

   n = PV/RT

      = 0.03127*11.1/0.0821*298 = 0.01418 moles/min

mass of water = volume * density = 25000*1 = 25000g

no of moles of water = 25000/18 = 1388.88 moles

     1388mole* min/0.01419mole = 97815 min >>>> answer

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