Suppose that you had a 0.23 cm thick window (0.23 x 10-2 m) conducting heat from the 38.7 C air outside to the 17.6 C air inside of a room. If the window were 1.81 m wide and 2.02 m tall, how much conductivity would give you heat conduction through the window at 4.2 x 103 J/s?