latent Heat of Vaporisation

(a) Define the term 'latent heat of vaporisation' of a liquid. What is the value of the latent heat of vaporisation of water ? (b) Draw a labelled diagram of the experimental set-up to study the latent heat of vaporisation of water.

Is it possible that water evaporates from a spherical drop of water just by means of surface energy supplying the necessary latent heat of vaporisation? The drop does not use its internal thermal energy and does not receive any heat from outside. It is known that water drops of size less than 10^(–6) m do not exist. Latent heat of vaporisation of water is L = 2.3 × 10^(6) Jkg^(–1) and surface tension is T = 0.07 Nm^(–1) .

1 g of water, of volume 1 cm^3 at 100^@C , is converted into steam at same temperature under normal atmospheric pressure (= 1 xx 10^5 Pa) . The volume of steam formed equals 1671 cm^3 . If the specific latent heat of vaporisation of water is 2256 J/g, the change in internal energy is

The vapour pressure of a certain liquid is given by the equation: Log_(10)P = 3.54595 - (313.7)/(T) +1.40655 log_(10)T where P is the vapour pressure in mm and T = Kelvin Temperature. Determine the molar latent heat of vaporisation as a function of temperature. calculate the its value at 80K .

A thermally insulated pot has 200 g ice at temperature 0^(@)C . How much steam of 100^(@)C has to be mixed to it, so that water of temperature 40^(@)C will be obtained? (Given: Latent heat of melting of ice = 80 cal/g, latent heat of vaporisation of water = 540 cal/g, specific heat of water = I " cal/g " ^(@)C)

1 mole of ice at 0^(@)C and 4.6 mm Hg pressure is converted to water vapour at a constant temperature and pressure. Find Delta H and Delta E if the latent heat of fusion of ice is 80 cal//g and latent heat of vaporisation of liquid water at 0^(@)C is 596 cal//g and the volume of ice in comparison to that of water (vapour) in neglected.

Which of the following statements is/are incorrect? I. Temperature does not change during the change of a state. II. Dry ice gets converted directly into gaseous state at 1 atm pressure. III. Lower boiling point of a liquid indicates weaker intermolecular forces. IV. Latent heat of fusion is generally higher than the latent heat of vaporisation for a substance.