To calculate the amount of heat absorbed or released during the crystallization of sodium acetate, we can use the following formula:q = n * Hwhere q is the heat absorbed or released, n is the number of moles, and H is the heat of crystallization.Given:n = 2.5 molesH = -427 kJ/molNow, we can plug in the values into the formula:q = 2.5 moles * -427 kJ/mol q = -1067.5 kJSince the value of q is negative, it indicates that heat is released during the crystallization process. Therefore, 1067.5 kJ of heat is released when 2.5 moles of sodium acetate crystallize from its solution at 25C.