Question

For a gaseous reaction, standard conditions are 298 K and a partial pressure of 1 atm for all species.


For the reaction


2NO(g)+O2(g)↽−−⇀2NO2(g)



the standard change in Gibbs free energy is Δ

Answer 1

The standard Gibbs energy change is -32.8 kJ/mol.

The temperature is 298 K.

The partial pressure of NO is 0.500 atm.

The partial pressure of O₂ is 0.450 atm.

The partial pressure of NO₂ is 0.850 atm.

Calculations:

The formula of Gibbs free energy change is shown below.

For the given reaction, the reaction quotient can be written as follows:

Substitute the known values in equation (II).

Now, substitute all the known values in the expression (I).