Standard entropies of ${{\rm{X}}_2},{{\rm{Y}}_2}$ and ${\rm{X}}{{\rm{Y}}_5}$ are 70, 50 and $110{\mkern 1mu} {\rm{J}}{{\rm{K}}^{-1}}{\rm{mo}}{{\rm{l}}^{-1}}$ respectively. The temperature in Kelvin at which the reaction $\frac{1}{2}{{\rm{X}}_2} + \frac{5}{2}{{\rm{Y}}_2}{\rm{X}}{{\rm{Y}}_5}\Delta {{\rm{H}}^\Theta } = - 35\;{\rm{kJ}}\;{\rm{mo}}{{\rm{l}}^{ - 1}}$ will be at equilibrium is________ (Nearest integer)