A schematic temperature-time (Tt) profile under constant pressure is shown here for a onecomponent system. Answer the following questions: a) Why is there a thermal arrest on the curve, i.e. the constant temperature for a duration of time? What determines the duration of the thermal arrest? (5pt) b) What determines the slope of the curves besides the thermal arrest? (5pt) c) If the heat addition (for heating) to or extraction (for cooling) from the system is given as dQ/dt, derive equations for the slopes of the lines before and after the thermal arrest and the duration of the thermal arrest. (5pt)