At 1 atm, a 1.0 mol sample of H₂O is taken from −10 °C ice to 110 °C steam in five consecutive steps:
I. warming the ice from −10 °C to 0 °C
II. melting the ice at 0 °C
III. warming the liquid from 0 °C to 100 °C
IV. vaporizing the liquid at 100 °C
V. warming the steam from 100 °C to 110 °C
Which step contributes the largest positive entropy change to the system?
a) Step II
b) Step III
c) Step IV
d) Step I