Liquid water is contained in two identical beakers open to the atmosphere
CHEMISTRY · Single correct · A Level · Chemistry · Thermodynamics · Thermodynamics
Problem
Liquid water is contained in two identical beakers open to the atmosphere. One beaker is at 25 °C, and the other is at 80 °C. Which of the following correctly compares the molar entropy of the water in the two beakers?
(a) The two samples have the same molar entropy because both are liquid water at 1atm.
(b) The 25 °C sample has the greater molar entropy because stronger hydrogen bonding at lower temperature allows more possible orientations.
(c) The 80 °C sample has the greater molar entropy because the distribution of molecular kinetic energies is broader at the higher temperature.
(d) The 80 °C sample has about 3.4 times the molar entropy of the 25 °C sample because entropy is directly proportional to absolute temperature.