`50m^(3)` of saturated vapour is cooled down from `30^(@)C`to `20^(@)C.Find the mass of the water condensed. The absolute humidity of saturated water vapour is `30g m^(-3)`at `30^(@)C`and `16g m^(-3) at 20^(@)C`.

The saturation vapour pressure of water at 100^(@)C is

50g of a saturated aqueous solution of potassium chloride at 30^(@)C is evaporated to dryness, when 13.2 g of dry KCl was obtained. Calculate the solubility of KCl in water at 30^(@)C .

A mass of 50g of water in a closed vessel, with surroundings at a constant temperature takes 2 minutes to cool from 30^(@)C to 25^(@)C . A mass of 100g of another liquid in an identical vessel with identical surroundings takes the same time to cool from 30^(@) C to 25^(@)C . The specific heat of the liquid is: (The water equivalent of the vessel is 30g.)

A body cools from 50^(@)C to 40^(@)C in 5 min. The surroundings temperature is 20^(@)C . In what further times (in minutes) will it cool to 30^(@)C ?