What are the values of (a) $\Delta_{f} G^{\circ}\left(O_{2}, g, 298 \mathrm{K}\right)$
(b) $\Delta_{\mathrm{f}} G^{\circ}\left(\mathrm{O}_{2}, \mathrm{g}, 450 \mathrm{K}\right),(\mathrm{c}) \Delta_{\mathrm{f}} H^{\circ}\left(\mathrm{O}_{2}, \mathrm{g}, 298 \mathrm{K}\right)$ and
(d) $\Delta_{f} H^{\circ}\left(\mathrm{O}_{2}, \mathrm{g}, 500 \mathrm{K}\right) ?$