In the phase diagram for a one-component system, a point 'a' lies in a single-phase region, points 'b' and 'c' lie on triple points, and a point 'd' lies on a two-phase coexistence curve. The number of degrees of freedom at the points marked a, b, c, and d, respectively, are:

For a spontaneous process occurring at constant temperature and pressure, the changes in Gibbs free energy (ΔG) and entropy (ΔS) satisfy:

For a phase reaction A ⇌ B, the standard Gibbs free energy change is given by ΔG° = 105 - 35 log10 T (in J mol-1). Find the transition temperature (in °C) of the reaction at 1 bar pressure.