If for a certain reaction Δ_r H is 30 kJ mol^-1 at 450 K, the value of Δ_r S (in JK^-1 mol^-1 ) for which the same reaction will be spontaneous at…

If for a certain reaction $\displaystyle \Delta_{\mathrm{r}} \mathrm{H}$ is $\displaystyle 30 \mathrm{~kJ} \mathrm{~mol}^{-1}$ at $\displaystyle 450$ K , the value of $\displaystyle \Delta_{\mathrm{r}} \mathrm{S}$ (in $\displaystyle \mathrm{JK}^{-1} \mathrm{~mol}^{-1}$ ) for which the same reaction will be spontaneous at the same temperature is