Question

define and explain the standard enthalpy of sublimation standard enthalpy of vapourisation standard enthalpy of fusion enthalpy of phase transformation enthalpy of combustion enthalpy of atomisation

Answer 1

●Enthalpy of sublimation of a given substance is defined as the enthalpy change when one mole of the given substance in solid form is converted into vapour phase at the said temperature. One of the examples is

I2(s) → I2(g)

●When a weak acid (or base) reacts with a strong base (or acid), the release of heat is less than 57.3 kJ. It is because of the fact that these acids or bases are not completely ionized in solution. Some of the heat is consumed in ionizing these acids and bases. This energy is known as enthalpy of ionization