The specific heat ${\mathrm{I}}_2$ in vapour and solid state are 0.031 and 0.055 cal/g respectively. The heat of sublimation of iodine at ${200}^0\mathrm{C}$ is 6.096kcal ${\mathrm{mol}}^{-1}$ The heat of sublimation of iodine at   ${250}^{\circ }\mathrm{C}$ will be