Standard entropy of $X_2$, $Y_2$, and $XY_3$ are 60, 40, and 50 J K$^{-1}$ mol$^{-1}$, respectively. For the reaction,
$$ \frac{1}{2} X_2 + \frac{3}{2} Y_2 \rightarrow XY_3, $$
with $\Delta H = -30 \, \text{kJ}$, to be at equilibrium, the temperature will be: