Abox with sides of length 40 cm is made up of six pieces of concrete of thickness 5 mm. the inside of the box is filled with 100 moles of a diatomic ideal gas while the temperature outside the box is 30°c. at what rate is the temperature of the gas increasing when the gas is at -40°c? (the thermal conductivity of concrete is 0.33 w/(m×) 1.22 °c/s b) 1.45 °c/s c) 1.68 °c/s d) 2.13 °c/s e) 2.90 °c/s