A room, cubic in shape has an edge length of 500 cm. The room temperature is 27°C and the relative humidity inside the room is 40%. How many killo-grams of anhydrous calcium oxide are required to keep the air dry in the room ? Assume ideal behaviour for water vapour.
(Given → vapour pressure of water at 27° C = 19 torr ; give your answer in the form of nearest integer)
Text Solution
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Sol. %R.H = 
⇒ Partial vapour pressure of water = 
= 7.6 torr
⇒ No. of moles of water vapour in the room
= 
Now using CaO + H 2 O → Ca(OH) 2
wt. of CaO required = 
= Kg
= 2.912 Kg ~ 3 Kg
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