For the reaction: 4Ag(s, pure) + O₂(g) ⟶ 2Ag₂O(s, pure), the standard enthalpy change, ∆𝐻⁰ = − 61080 J, and the standard entropy change, ∆𝑆⁰ = − 132.22 J K⁻¹, in the temperature range from 298 K to 500 K.

The temperature above which Ag₂O decomposes in an atmosphere containing oxygen at a partial pressure 𝑝𝑂2    = 0.3 atm is              (in K to one decimal place).

Given: Gas constant R = 8.314 J K^-1 mol^-1