2O₃(g) ⇌ 3O₂(g)
At 300K, ozone is fifty percent dissociated. The standard free energy change at this temperature and 1 atm pressure is (-)J mol⁻¹. (Nearest integer)
[Given: ln 1.35 = 0.3 and R = 8.3JK⁻¹mol⁻¹]

A. 747
B. 747.0
C. 747.00