Segments A, C, and E represent energy transfer from the heating source (heat) resulting in the increase in temperature of each particular state. Segments B and D represent heat transfer which is consumed by a change of state.

Segment A represents the heat absorbed by ice providing an increase in temperature. The Specific Heat Capacity of Ice is J/mole▪ o C.

= warming of ice q=nC ice Δt; C ice = J/mole▪ o C

Segment B represents the equilibrium between the solid phase of water (ice) and the liquid phase. The energy associated with this phase change is defined as the Molar Heat of Fusion (ΔH fusion ). ΔH fusion equals kJ/mole. The temperature of this segment defines the melting point of ice.

= phase change s  l q=n ΔH fus ; ΔH fus = kJ/mole

Segment C exhibits the heat absorbed by liquid water resulting in a temperature increase. The Specific Heat Capacity of Water is 75.4 J/mole▪ o C.

= warming of liquid water q=nC liquid Δt; C liquid = 75.4 J/mole▪ o C

Segment D defines the equilibrium between the liquid and gas phase of water. The energy associated with this phase change is defined as the Molar Heat of Vaporization (ΔH vap ). ΔH vap equals kJ/mole. The temperature of this segment defines the boiling point of water.

= phase change l  g q=n ΔH vap ; ΔH vap = kJ/mole

Segment E represents the heat absorbed by water vapor providing an increase in temperature. The Specific Heat Capacity of Water Vapor is J/mole▪ o C.

warming of water vapor = q=nC vap Δt; C vap = J/mole▪ o C