Why is the molar heat of vapourisation of water higher than that of alcohol?

The molar enthalpy of vaporisation of acetone is less than that of water. Why ?

Why is the ionisation energy of lead slightly higher than that of tin?

Calculate the entropy change for vapourisation of water if latent heat of vapourisation for water is 540 cal/g. ( K_(b) for water =0.51 K. kg "mole"^(-1) )

Is the specific heat of water greater than that of sand?

Why is the ionisation enthalpy of hydrogen higher than that of sodium ?

Why is the ionisation enthalpy of magnesium higher than that of potassium ?

Dipole moments of aldehydes and ketones are higher than the alcohols. Why?

Water is a universal solvent. But alcohol also dissolves most of the substances soluble in water. Boiling point of water is 100^(@)C and that of alcohol is 80^(@)C . The specific heat of water is much higher than the specific heat of alcohol. (a) List out three possible differences if instead of water as the liquid in our body we had alcohol. (b) What value can you derive from this special property of water and its innumerable uses in sustaining life on earth?

Why the boiling point of ethyl bromide is higher than that of ethyl chloride?

Why is the cooking temperature in pressure cooker higher than that in the open pan?