Saturated steam at 300°c is used to heat a countercurrently flowing stream of methanol vapor from 65°c to 260°c in an adiabatic heat exchanger. the flow rate of the methanol is 6500 standard liters per minute, and the steam condenses and leaves the heat exchanger as liquid water at 90°c. calculate the required flow rate of the entering steam in m3/min. calculate the rate of heat transfer from the water to the methanol (kw). suppose the outlet temperature of the methanol is measured and found to be 240°c instead of the specified value of 260°c. list five possible realistic explanations for the 20°c difference.