Question

What information about water is needed to calculate the enthalpy change for converting 1 mol H2O(g) at 100 °C to H2O(l) at 80 °C? (a) Heat of fusion, (b) heat of vaporization, (c) heat of vaporization and specific heat of H2O(g), (d) heat of vaporization and specific heat of H2O(l), (e) heat of fusion and specific heat of H2O(l).

Answer 1

The information needed includes the heat of vaporization and specific heat of H₂O(l).

Step-by-step explanation:

The information needed to calculate the enthalpy change for converting 1 mol H₂O(g) at 100 °C to H₂O(l) at 80 °C is the (d) heat of vaporization and specific heat of H₂O(l).

The heat of vaporization is required because it accounts for the energy needed to convert water from a liquid to vapor state. The specific heat of H₂O(l) is needed to determine the amount of heat required to change the temperature of liquid water from 100 °C to 80 °C.