Question

Answer the following questions related to H2O.

Substance ΔG°f at 298K(kJ/mol)
H₂O(l) −237.2
H₂O(g) −228.4

Using the information in the table above, determine the value of ΔG° at 298K for the process represented by the equation H₂O(l)⇄H₂O(g).

Answer 1

To determine the value of ΔG° at 298K for the process represented by the equation H₂O(l) ⇄ H₂O(g), you need to calculate the standard free energy change using the equation ΔG° = ΔH° - TΔS°.

Step-by-step explanation:

To determine the value of ΔG° at 298K for the process represented by the equation H₂O(l) ⇄ H₂O(g), we need to calculate the standard free energy change (ΔG°) using the equation ΔG° = ΔH° - TΔS°. Here's how to do it:

1. Find the enthalpy change (ΔH°) from the table provided. In this case, it is given as 286 kJ. Convert it to J by multiplying by 1000.
2. Calculate the entropy change (ΔS°) using the formula ΔS° = S°(H₂O(g)) - S°(H₂O(l)). The entropy values can be found in the table as well.
3. Now, substitute the values into the equation: ΔG° = ΔH° - TΔS°. The temperature (T) is given as 298 K.
4. Calculate the standard free energy change (ΔG°) using the equation.

The resulting value will be the answer to your question.