Explanation:
Assuming that pressure is equal to
1 atm
, boiling water at its boiling point implies providing it with enough heat to turn it from liquid at
100
∘
C
to vapor at
100
∘
C
.
The amount of heat needed to allow one mole of water to undergo this phase change is called the enthalpy chnge of vaporization,
Δ
H
vap .For water at
100
∘
C
, the enthalpy change of vaporization is equal to
Δ
H
vap
40.66 kJ/mol
