A 1.2 m high and 2.0 m wide double-pane window separates an interior room from the outdoors. The window consists of two layers of glass separated by a stagnant air space. For an outside air temperature of -5 C and an interior air temperature of 24 C the steady rate of heat transfer through the window is 114 W. The convective heat transfer coefficients in air on the interior and exterior surfaces of the window are 10 W/m-K and 25 W/m-K, respectively. What is the glass surface temperature on the exterior side of the window?