1. The problem statement, all variables and given/known data The temperature in an electric oven is 158°C. The temperature at the outer surface in the kitchen is 51°C. The oven (surface area = 1.8 m2) is insulated with material that has a thickness of 0.023 m and a thermal conductivity of 0.045 J/(s·m·°C). (a) How much energy is used to operate the oven for 7 hours? 2. Relevant equations Q = (k A deltaT time)/L 3. The attempt at a solution k = .045 A = 1.8 deltaT = 107 time = 7 L = .023 I got 2637.78 but it says that's wrong. What did I do wrong?