At a given temperature and pressure, the enthalpies of condensation and vaporisation for a given liquid, are the same but opposite in sign. Why?

At the same temperature and pressure , the ratio of rate of diffusion of helium and methane is -

At a given temperature and pressure, the volume fraction of an ideal gas is equal to its mole fraction in a mixture of ideal gases- it is true or false?

At a given temperature annd pressure, the volume of 10 g of He gas is 61.6 L. how much of He gas has to be taken out at the same temperature and pressure to reduce its volume to 25 L?

At a given temperature and pressure, the volume of 1 mol of an ideal gas is 10 L. at the same temperature and pressure, the volume of 1 mol of a real gas is VL. At this temperature and pressure, if the compressibility factor of the real gas is greater than 1, then -

Calculate (1) the enthalpy change in the fusion of 100 g ice at 0^(@)C temperature and 1 atm pressure pressure (2) the enthalpy change in the vaporisation of 10g water at 100^(@)C temperature and 1 atm pressure. Givenn : Latent heat of ice at 0^(@)C temperature and 1 atm pressure =6.02kJ*mol^(-1) and latent heat of vaporisation of water at 100^(@)C temperature= 40.4kJ*mol^(-1) .

The vapour pressure of a given liquid will decrease if :

Write equilibrium constant in terms of partial pressure and molar concentration. Why vaporisation of water takes place rapidly at low pressure and high temperature.

At normal temperature and pressure the velocity of sound in air is 330 m/s . If the temperature increased to 30^@C and the pressure remains the same the velocity of sound in air will be

Calculate the values of Delta H and DeltaU in the vaporisation of 90g of water at 100^(@)C and 1 atm pressure. The latent heat of vaporisation of water at the same temperature and pressure =540cal*g^(-1)