A spherical container has inner radius r1 = 8 cm, outer radius r2 =10 cm, and thermal conductivity k = 45 W/m·K. The inner and outer surfaces of the container are maintained at constant temperatures of T1 = 200°C and T2 = 80°C, respectively, as a result of some chemical reactions occurring inside. Obtain a general relation for the temperature distribution inside the shell under steady conditions, and determine the rate of heat loss from the container.