The right formula to use for this calculation is the heat capacity formula, Heat absorbed, Q = MCT, Where M = Mass of the substance = 71 C = Specific heat capacity for iron = 0.450 J/gc T = Change in temperature = 29 - 11 = 18 Q = 71 * 0.450 *18 = 575.10 The amount of heat absorbed by the iron skillet is 575 J.