Will the following reaction occur spontaneously at 25°C? Justify your answer. 3 O2(g) → 2 O3(g)
∆H°rxn = 285 kJ/mol ∆S°rxn = −137 J/mol·K

if the concentration of products is decreased, the equilibrium will shift toward the products). add an inert gas (one that is not involved in the reaction) to the constant-volume reaction mixture: this will increase the total pressure of the system, but will have no effect on the equilibrium condition.

explanation:

the temperature of the gas, in k, not celsius.

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.