Summary:
- Reaction is non-spontaneous at room temperature, but becomes spontaneous at temperature above 842 K. Reaction is endothermic with an increase in entropy due to the production of a gas.
- At any temperature higher than 835°C, the value of will be negative and the decomposition reaction will be spontaneous.
- At lower temperatures, the amount of products formed is simply not great enough to say that the products are favored.
- The pressure of CO2 at equilibrium gradually increases with increasing temperature.