Standard entropies of X₂, Y₂ and XY₅ are 70, 50 and 110 J K^–1 mol^–1 respectively. The temperature in Kelvin at which the reaction
$\frac{1}{2}{\mathrm{X}}_2+\frac{5}{2}{\mathrm{Y}}_2\to {\mathrm{XY}}_5{\mathrm{\Delta H}}^{-}=-35{\mathrm{kJmol}}^{-1}$
Will be at equilibrium is ____ (Nearest integer)