Question

Converting liquid water to solid water (ice) releases 1.44 kcal/mol energy. Write a reaction (chemical equation) showing heat in its correct place.

a) H2O(l) → H2O(s) + 1.44 kcal
b) H2O(s) → H2O(l) + 1.44 kcal
c) 1.44 kcal → H2O(l) → H2O(s)
d) 1.44 kcal → H2O(s) → H2O(l)

Answer 1

The correct chemical equation is H2O(l) → H2O(s) + 1.44 kcal, demonstrating the exothermic nature of water freezing, during which heat is released.

Step-by-step explanation:

The correct chemical equation that represents the conversion of liquid water to solid water (ice) and shows the release of 1.44 kcal/mol of energy is: H2O(l) → H2O(s) + 1.44 kcal. This equation indicates that the process of freezing water is exothermic as heat is released. Every substance has a unique value for its molar heat of fusion, which is the amount of energy required to change 1 mol of the substance from the solid state to the liquid state without a change in temperature. For water, when 1 mol of water at 0°C freezes to ice at 0°C, 6.01 kJ (or 1.44 kcal) of heat is released into the surroundings.